The TTIP is an EU trade agreement, it's negotiated by the EU not sovereign states. The EU Trade Commission negotiates on behalf of the EU with consultation to the EU Trade Policy Committee. The UK delegate to the TPC is, I believe, Chris Barton - Director, International Affairs, Trade Policy & Export Control at Department for Business, Innovation and Skills.
So there you are Scorza, Chris Barton has been actively involved in the negotiation of the TTIP on behalf of the UK.
This one? Citation needed.