My point it that there are few london restaurants, normally ones that have night clubs on the premises, that have a minimum age requirement, even for the restaurant area. I do not believe that any of the ones mentioned above would fall into that category. I think the one that is most notorious is the Roadhouse in Covent Garden. By the nature of its name and location it has a tendency to sound attractive to a younger crowd, but in fact in operates an over 21 policy even in the restaurant. The only one in the list above that might be problematic is The Absolut Ice Bar which allows minors before 7pm, but after that it's 18 +.