thats tosh. there were no laws passed in the UK to enable sharia finance.
what has actually happened, is when you deposit money in a islamic bank - they will ask you if you are 'depositing' the full amount (i.e. protected by the 90%/30K rule), or if you are depositing a lower amount and risking the rest.
This means you are earning the same interest as a high street bank - but you do not have the same protection as a high street bank.

now the trouble is - what will happen when an islamic bank goes t1ts up and all the customers only get half of there deposits rather than the 90% which is protected by the bank of england??

I think we know now (after the northern rock fiasco) that the government will step in and replay the deposits

which is totally unacceptable to the rest of us.