我用working holiday visa去英國留2年, o係倫敦搵part time係唔係好難?

If you are looking for part-time at fast food restaurant, supermarket, you will have to fill in an application form. For Chinese Restaurant/takeaway, you can try and knock on their door but the salary may be lower than supermarket.

Alternatively, try gumtree: http://www.gumtree.com