We'll hope 4 & 9 soon follow -

re recommendation for good ISP for Fibre there are many deals out there , but as the saying goes 'you only get what you pay for'. Guess it depends on what your demand will be from the household , gaming, streaming, large downloads/uploads etc.
Sometimes the cheaper monthly deals will put a cap on usage , go over this and it could be expensive, unlimited and your safer, and of course there's Infinity 1 & 2 , guess this will depend on your locality to FTTC and how far it is from exchange.
Personally I have been checking forums for both Sky & BT ( I am currently with Sky ) and on there Fibre BB forum there are many complaints of reducing of speed, but this seems to be if you are on lower package. It is said BT do not reduce speed , so from my perspective I am looking at moving to BT , as I have phone with them for business . No doubt there will be varying opinions and more expert comment on your question