IT'S getting pretty crowded with films on all our channels in Britain. The big boy now on the block is the B4U movie channel coming in after Zee TV and Sony, not to mention some of the smaller players like TV Asia. All of Britain has lived for years with only four channels, and now you have four others for just a sub-continental million-and-a-half. The new seducer is that Calcutta-born steel-mill buyer Laxmi Mittal who set up B4U (a supposedly smartened version of Bollywood For You) along with Kishore Lulla of Eros and businessman Gokul Binani.