I presume he means early termination fee, but YouFibre normally either pay you out of your contract, or charge you £1 a month until your existing contract tie in period ends!
I'm with YouFibre, only on the 1gbps package, but absolutely superb service. Only thing to look out for is them using CGNAT but you can buy a static IP for +£5 a month. Not sure if EE use CGNAT or not.
There's a thread on here somewhere with a few of us using YouFibre, can also help out with referral if you want, both get some credit then