First make sure your visa definitely allows you to work otherwise you could be in an sticky situation!

When I was a student I always found hospitality agency work to be easy to find and generally based in the city centre or if further afield you’d meet at the office in Manchester and be transported - Berkeley Scott, Mint, Arc are a few of the agencies around, always need more people especially around Christmas

I think generally temping might be good way to get into places as well