Im looking to move to fibre broadband.

Virginmedia look good, £17 line rental and £4 for first 12 months.

My question is what happens after 12 months, obviously intro price goes up but as far as i can see there is no penalty to change to another provider, is that correct?

If the contract is for 12 months you can move penalty free but if it's for 18 then you'll have to stop. That is unless they put the prices up, as they should then give you the option to leave penalty free.

I have their 150Mb broadband. It's great.

Depends what your city is like... I had them in Plymouth and they were terrible... Seriously slow... I suspect over subscribed.

Switched to Plusnet fibre and haven't looked back!