I found two titles published by Lance Publications, ie Britsh Sex and Harmony. They are clearly modeled on the European style A5 magazines such as those from Color Climax. I can confirm that they are fully hardcore with a similar feel to their European counterparts, ie all picture strips with no real textual content. The only apparent concessions to UK sensitivities is that cum shots seem limited to the immediate aftermath and there is a total absence of anal sex. Therefore the only censorship applied to print media is that enacted in the Obscene Publications Act - which only comes into effect after the print media have been published.
Obscenity is defined as that which tends to deprave or corrupt.
Numerous obscenity case have apparently collapsed or ended in innocent verdicts in recent years so the police and the CPS shy away from prosecuting. Over the past two or three years the explicitness level of softcore mags in the UK has risen in all sectors of the market. Clearly erections are no longer used as a marker of obscenity, as a visit to your local corner shop will quickly demonstrate. Maintaining this trend there are now versions of European hardcore mags such as Private on fairly open sale in the UK, but I have chosen the word 'version' advisedly. The limited number of these that I have seen have been re-edited from the original versions to remove pictures of ejaculations and anal penetration.