Thomas, a Tech rep is a company representative who is usually an engineer who deals with Technical problems that may arise with his employers product.
Turbomeca and Eurocopter both have, or have had Tech reps in the UK to deal with various problems.
As for the unlicensed work as a mechanic, most people will look for some experience, you would probably be better off trying Airbus, Westlands, Rolls Royce and other manufacturers. There is also Eurocopter uk based in Oxford, your mother tongue may come in useful there.