The best thing to do would be to contact the handling agents at Manchester and Liverpool Airports, as these are the companies responsible for passenger and ramp handling of aircraft. Check the websites for Servisair, Swissport UK, aviance UK and Menzies Aviation who are the big handlers in the UK. Some airlines (like bmi) do have passenger service agents at Manchester, though the majority of work now is by handling agents.
Starting somewhere like ramp agent or pax services agent is a great way to get aviation experience, and usually leads to more exciting careers along the line.