Hmm, just had some interesting news which I totally somehow never saw on samknows..
This exchange we are in is currently due to be upgraded to FTTC in September, with an estimation of rolling out to us on Sept 30th, BT infinity 2 at £25/month looks pretty good, upto 40mb depending obviously on where your local greenbox is (googlemapping it now!) But would it be a viable choice to jump onto bt broadband for a month or 2 to move on to infinity, or would they, do you think, try and sting me for more if I were to change "products"?