Could the rating for the trailer be an old one and BFI didn't want to pay for both a new film rating and a trailer rating?

I don't have the trailer to hand to check, but Dr Amicus's reasoning sounds plausible.

Separation, The Other Side of the Underneath and Anti-Clock
Three ‘lost’ British films by Jane Arden and Jack Bond - newly restored by the BFI for DVD, Blu-ray and on the big screen at BFI Southbank in July

Jane Arden and Jack Bond produced three of Britain’s most challenging and provocative films – Separation (Jack Bond, 1968), The Other Side of the Underneath (Jane Arden, 1972) and Anti-Clock (Arden and Bond, 1979). Unseen since just after Arden's suicide in 1982, the films genuinely represent completely ‘lost’ works of recent British cinema history.

On 13 July each newly restored film, along with a range of extra features, will be released on BFI DVD and Blu-ray. On 14 July Separation will be screened at BFI Southbank, introduced by Jack Bond who will take part in a Q&A afterwards. The Other Side of the Underneath and Anti-Clock will be shown in the Studio at BFI Southbank on 5 & 18 July and 16 & 17 July respectively. An Arden/Bond season will take place at The Cube Microplex cinema, Bristol, when the three films will be screened in consecutive order from Mon 20 – Weds 22 July.

Born in Wales in 1927, Jane Arden was an actress, author and filmmaker whose screenwriting and directorial work of the late 60s and 70s explored themes of sexual politics, radical feminism, social alienation and ‘madness’. Made at a time when there were very few distinctive female voices in British cinema, the films she wrote and directed with director-producer Jack Bond (Dali in New York, It Couldn’t Happen Here) constitute a unique and unclassifiable body of work, ranging from Separation’s counter-cultural flamboyance of swinging 60s London to Anti-Clock’s boundary-pushing psycho-exploration.

Separation

Scripted by and starring Jane Arden, Separation concerns the inner life of a woman during a period of breakdown – marital, and possibly mental. Her past and (possible?) future are revealed through a fragmented but brilliantly achieved and often humorous narrative, in which dreams and desires are as real as the ‘swinging’ London of the film’s setting, complete with Procul Harum music and Mark Boyle projections.

Special features
• New full-feature audio commentary with Jack Bond
• Beyond Image (Mark Boyle & Joan Hills, 1969, 14 minutes) – a rare liquid light film co-created by leading British artist Mark Boyle, whose visual effects are used throughout Separation. With music by The Soft Machine
• Trailer for Anti-Clock (Jane Arden/Jack Bond, 1979)
• Illustrated booklet with essays by William Fowler, Claire Monk, Amy Simmons, Maria Walsh; biographies and credits

The Other Side of the Underneath

Starring Sheila Allen – with Penny Slinger, Liz Danciger, Ann Lynn, and Natasha Morgan

Arden’s violent and powerful adaptation of her work with The Holocaust women’s theatre troupe looks into the mind of a woman labelled schizophrenic – and finds not madness, but tortured sexual guilt created by the taboos of society.

Special features
• ‘Workprint’ version of feature (Blu-ray only)
• Extended sequences
• Filmed interviews with Sheila Allen (2008) and Natasha Morgan (2007)
• Trailer for Anti-Clock (Jane Arden/Jack Bond, 1979)
• Illustrated booklet with essays by Susan Croft, Sophie Mayer, Amy Simmons, Penny Slinger; reviews, biographies and credits

Anti-Clock

A complex and fascinating experimental exploration of time and identity.

‘Anti-Clock is a film of authentic, startling originality. Brilliantly mixing cinema and video techniques, Arden and Bond have created a movie that captures the anxiety and sense of danger that has infiltrated the consciousness of so many people in western society. Filled with high tension and high intelligence, Anti-Clock is mysterious, disturbing, fascinating and exciting.’ – Jack Kroll, Newsweek

‘Anti-Clock … is great!’ – Andy Warhol

‘A futuristic masterpiece’ – Claude Chabrol

Special features
• Jack Bond’s 2005 re-edit of feature
• Vibration (1974, 36 minutes): Arden and Bond’s experimental Super-8 visual ‘tone poem’
• Original trailer
• Illustrated booklet with contributions by Jack Bond, Chris Darke, and Penny Slinger; reviews, biographies and credits

Release date: 13 July 2009
RRP: DVD £19.99 each / Blu-ray £24.99 each

Separation: UK / 1968 / black and white, and colour / cert 15 / English language with hard-of-hearing subtitles / 89 minutes / Ratio 1.85:1 / Region 0
DVD cat no: BFIVD828 Blu-ray cat no: BFIB1022

The Other Side of the Underneath: UK / 1972 / colour / cert 18 / English language with hard-of-hearing subtitles / 106 minutes / Ratio 1.33:1 / Region 0
DVD Cat no: BFIVD829 / Blu-ray cat no: BFIB1011

Anti-Clock: UK / 1979 / colour / cert 18 / English language with hard-of-hearing subtitles / 92 minutes / Ratio 1.33:1 / Region 0 / 2-disc set
DVD cat no: BFIVD830 / Blu-ray cat no: BFIB1023

Just a query re The Other Side of the Underneath...

The BBFC pass in 1972 gives the running time as 142:13, while the DVD pass has 106:32. Is the 1972 time an error, or is the 142-minute version the workprint cut?

In view of the above exchanges, and that the original cut is 106 minutes, what is the source of the material added to the 'workprint', and the 'extended scenes' on the DVD? In short, where did that stuff come from?

And presumably Jack Bond knew where to put it into the release print?

A fuzzy, muddled plot with no direction makes this British film a basic blob. Arden, the subject of this mess, is going through the stages of a nervous breakdown after her marriage ends. A collage of scenes shows her in a series of real or imaginary confrontations with her husband, her new young lover and her psychiatrist. The story line is obscure and self-indulgent, with some nudity.

A tiresome and confused independent production that focuses on the schizophrenia of a group of girls in a therapy session. Bordering on surrealism, it never quite reveals the causes of their disease.

The sort of film that gives art houses and film schools a bad name, ANTI-CLOCK is an awful, pretentious, overlong comedy about one man's journey to higher knowledge. Sebastian Saville undertakes a dual role as both Joseph Sapha, who rebels against enforced conformist thought, and Prof. Zanov, the man responsible for keeping Joseph from getting any big ideas, which, of course, he gets anyway. Joseph comes to feel acutely connected to the rest of universe, but mostly he issues ridiculously bombastic pronouncements about a world on the edge of apocalypse. Made over a period of three years by British experimental filmmakers Jack Bond and Jane Arden, who incorporate a number of video techniques into their production, ANTI-CLOCK is wholly forgettable.

Not odd at all when you take a look at tvguide.com. If I want to see this kind of reviewing I
turn to the ever trusty Halliwell.

Can anyone tell me what the correct screen ratios are for the dvds Separation has 1.33 on the box but is 1.85(16.9) The Other Side Of Underneath has 1.85 on the box is this correct? some reviews have it at 1.33 and Anti- clock is 1.33 on the dvd box .