If your looking for work in museums, Duxford as an earlier poster suggested is a great place to work. They take on around 10 summer seasonal staff a year in a customer facing role working alongside permanent staff. Summer season officially lasts from april till october, although many do what they can and they are flexible. It is good fun, working in an aviation environment and also will be a great opportunity to improve your english (and technical english too). Other museums or airfields/airports for that matter must do the same, the industry lends itself to summer seasonal workers, just get looking. Job ads for various stuff will probably appear in march. Good luck!