Help getting out of a BT Broadband contract early

hi,
I'm 18 months into a 24 month contract.
My current contract is 54mb for £30.
The line is mostly OK with some slow speeds in the peak hours.

I want to move to VM's M200 for £19pm. Less cost + more speed. But BT want me to pay an £63 penalty.

Anyway I can avoid this penalty.

thank you