Depends what you mean by 'aircraft handler'. The handling agents at Manchester often recruit for the summer, and (in the past) the first people tend to start in late March, so now is probably a good time to write a few letters. I did a summer for Servisair as a dispatcher 16 years ago (so obviously things are likely to be rather different now) but then enthusiasm and an existing interest in aviation seemed to help greatly. 2 A levels is probably more than some people taken on will have. Downside that hasn't changed looking at other threads on here is that the money is abysmal. Most people make ends meet (depending on circumstances of course) by working huge amounts of overtime in the summer, and as little as possible in the winter to try and recover. A look at the Manchester Airport website is probably a good place to start.