What new law; the one they introduced to crack down on women trafficked for prostitution? I don't think that'd have much bearing on the production of pornography/ erotica unless you're having women trafficked for the express purpose of starring in your videos :-o
I don't think there's any more constraints legally speaking on a producer of pornographic material than there are on anyone else. As long as you pay your taxes and operate conscientiously you'll be alright. Also I believe the legal age for wimminz to be in pornos in the UK is 18; don't quote me on that though.
EDIT: Some shitz from Wikipedia on the subject as it stands in the UK:
In Britain, where pornography is more restricted than it is in many other English-speaking or Western Europe countries, sexual media is easily smeared for an audience that is seldom given an opportunity to see what really is sold under the name of "pornography".[1] However the current British legislative framework including the Obscene Publications Act 1959 (in England and Wales), the Civic Government (Scotland) Act 1982 and the Video Recordings Act 1984 leads to a confusing situation in which there is a theoretical ban on the publication and distribution (but not possession) of pornographic material in any form, which is in practice unenforcable due to the vagueness of the legal test of material that "depraves and corrupts". In practice, hardcore material on video and DVD was until recently banned by the requirement under the Video Recordings Act to be certifed by the BBFC, while mainstream hardcore material in other forms such as magazines and websites is essentially unrestricted. European, American and British hardcore pornographic magazines are now openly sold in many British newsagents, for instance. Due to libralisation in BBFC policy, mainstream hardcore DVDs now receive R18 certificates, legalising them but restricting their sale to licensed sex shops such as those in Soho.
British-made pornography tends to focus on a rough-and-ready semi-amateur look rather than the more stylized glamourous look of mainland European pornography.
Producers such as Ben Dover lololol concentrate on producing "girl-next-door" or "candid" material. Some British pornography concentrates on sexual fetishism, particularly erotic spanking and rubber fetishism which has been popular in Britain since the 1950s.
Despite the existence of a national porn industry and widespread social acceptance of porn consumption, the UK is still the only Member State of the European Union that prohibits private imports of adult pornography by consumers coming from other Member States of the European Union. In the 2004-2005 fiscal year, the agents of Her Majesty Revenue & Customs seized 96783 items of pornographic media carried by people travelling into the UK".[2].
The UK porn industry is estimated to be now worth about 1 billion pounds, compared with 20 billion pounds worldwide
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In England and Wales, the main legislation on pornographic materials is contained in the Obscene Publications Act 1959, the Obscene Publications Act 1964 and the Indecent Displays (Control) Act 1981. Video-orientated depictions of hardcore material (with certain exceptions for works considered primarily 'artistic' rather than pornographic) were illegal until 1999, when trade-barrier difficulties with regards to European Community membership ensured the relatively free movement of such goods for personal importation only. R18-rated videos are only available in licensed sex shops, but hardcore pornographic magazines are available in newsagents' (shops selling newspapers, magazines, confectionary, et cetera). The Crown Prosecution Service is currently prosecuting a man under the Obscene Publications Act for a textual story posted on a pornography website involving Girls Aloud[16]. The Home Office brought forward legislation to criminalise possession of what it has labelled extreme pornography, now contained in sections 63 to 68 of the Criminal Justice and Immigration Act 2008 [17].
Child pornography is illegal (child is defined as a person under 18) to possess, make (in terms of electronic copies) and to distribute, and is punishable by up to 10 years custodial sentence on conviction. In England and Wales the law on this type of material is strictly defined by the Protection of Children Act 1978, Section 160 of the Criminal Justice Act 1988, further amended by the Criminal Justice and Public Order Act 1994 to include pseudo-photographs, and the Sexual Offences Act 2003 which raised the age from 16 to 18 (the age of consent in the UK is still 16). Sales of pornography is for over 18s only. In Scotland, similar provision is to be found in sections 52 and 52A of the Civic Government (Scotland) Act 1982, which was also amended by the 1994 Act and by the Protection of Children and Prevention of Sexual Offences (Scotland) Act 2005.
So yeah. Pornography of any kind is illegal to publish and distribute in the UK, however nobody is going to enforce this law because to do so would require a prosecutor to definitively prove that the material is likely to "deprave and corrupt" a person who views it; both terms which, to the best of my knowledge, are not legally defined anywhere. Also it says here that a child is defined as a person under the age of 18; that's for the purposes of appearing in pornographic material because the age of consent is 16. Just, y'know.... yeah. Bizarre.