Here are just some recruitment websites for restaurant chains in various locations all over London and the UK. There are, of course, hundreds of independent restaurants all over London so look in your local area for opportunities.
Cafe Rouge (French restaurant/cafe): http://www.caferougecareers.com/
Pizza Express (pizza/pasta): http://www.pizzaexpressyourself.com/
Prezzo (Italian): https://braavio.com/go/prezzoweb?
Zizzi (pizza/Italian): https://www.zizzi.co.uk/careers.
ASK (Pizza/Italian): http://www.askitalian.co.uk/#!/join-us
Pizza Hut (Pizza): http://www.careersatpizzahut.co.uk/
Gourmet Burger Kitchen (Burgers): http://gbk.ourvacancies.co.uk/
Browns (bar and brasserie): http://www.browns-restaurants.co.uk/jobs
Masala Zone (Indian): http://www.realindianfood.com/jobs.asp
Thai Square (Thai): http://thaisq.com/careers/
Wahaca (Mexican Street Food): http://www.wahaca.co.uk/tag/recruitment/
Beefeater Grill (meat grill): http://www.beefeatergrill.co.uk/beefeater/footer-pages/careers.html
Giraffe Bar (various): http://www.giraffe.net/careers
Yo Sushi (Japanese – Sushi): http://www.yorecruit.com/
La Tasca (Spanish Tapas): http://www.latasca.com/careers
Nandos (chicken): http://www.nandos.co.uk/careers
Cafe Brera (coffee, pizza): http://www.cafebrera.com/workwithus.htm
Brewer’s Fayre pubs (includes Beefeater, Costa, Premier Inn): http://www.whitbread.co.uk/careers/index.html
Jamie Oliver Restaurants: http://www.jamieoliver.com/careers
Brasserie Blanc: http://brasserieblanc.com/careers/working-bb/
Harvester (pub chain): http://www.harvester.co.uk/jobs/