Airline Transport Pilot Licence (Helicopters)
This is the licence towards which all pilots should aspire.
The requirements are as follows:
To be aged at least 21 years;
Pass the fourteen ATPL(H) theoretical knowledge examinations;
Have completed at least 1000hrs of flight time to include:
350hrs multi-pilot operations, 250hrs pilot-in-command (PIC), 200hrs cross-country flight time, 70hrs instrument time, and 100 hours night flight as PIC.
The only realistic route to this is to obtain your CPL(H) and then apply for a job on the North Sea. Don't worry about finding work, there's plenty of it about.