Good day,
Welcome to the UK!
I believe that this is the wrong time of year to be applying for ground handling jobs as the summer season has just finished and all the temporary summer staff not kept on for the winter season have been made jobless - sorry to be blunt but I don't think you will get a ground handling job before next summer now. Perhaps look at the Virgin Atlantic careers website and check for vacancies in the call center?.
Looking at aviation job search, the only role I can find is for an Operations Assistant based in South West London.
In my opinion, you would be best finding some seasonal work in a store of some sort to help improve your English and then reapply to the ground handling companies next year.
All the best