When I'm in London I host a regular dinner that anyone can come to. You sign up to an email list, which will send you an email three days before any dinner happens. You can then sign up on a google sheet, and, as long as there are enough spots, you can come and eat the food I cook (of variable quality... but certainly filling).
If you'd like to come send me an email at dorrellwec "at" gmail "dot" com and I'll add you to the list.