You really need to first discuss your proposals with your Distribution Network Operator (DNO) to ensure that their network can accommodate the generation. They'll advise of the works they would have to undertake to provide the connection and also the protection that needs to be in place on your side of the interface (reference document "G59" available from the Energy Networks Association http://www.ena-eng.org/ENA-Docs/).
For a WTG of this size, it's highly likely that the Under & Over Voltage and Under & Over Frequency protection may be provided within the WTG's own protection. Sometimes the "Loss of Mains" protection is also part of the WTG package. The DNO will advise if they require Neutral Voltage Displacement protection on the HV side of the connection.
For this rating, you'll have a choice as to whether your connection with the DNO is at HV (eg 11kV) or LV - ie the DNO install and owns the 11kV to LV transformer and all the HV cable & switchgear. The simplest, in my view will be for the latter arrangement as this avoids your having to provide an "Authorised Person" for the operation of your HV network.
The key regulations impacting on this type of installation are the Electricity, Safety, Quality & Continuity Regs 2002 as amended, and the Electricity @ Work Regs (get the "Memorandum of Guidance" to these Regs). The former is a free download, the latter is available from the HSE (Google). However, I agree with Arthur in recommending you get specialist assistance from a consultant or specialist contractor.
You may also find the Technical Guide to the Connection of Generation (free pdf download see page http://2010.energynetworks.org/distributed-generation/)
useful, even though this is now 6 years old.