Brilliant "Pan Asian" eat as much as you want set up - far better than the £7.50 usual Chinese buffets
http://www.cosmo-restaurants.co.uk/about.html
We got stuffed in the Croydon one today - handy for Ikea, Wing Yip, Costco etc
Mainly South East but also in Swindon, Bristol. £7.99 weekday lunchtimes, £14.99 all other times