hmm maybe in 10-15 years or so for the majority of a the Uk, i don't know??????? where i live (Toronto) its a common and very very very prevalent sight, i've French kissed my Bf anywhere without problem, i know its the same for a lot of NY city proper and San Francisco but i'm sure its the same for London too...
gay boys have a tendency to gravitate towards cities partly because of acceptance, partly because of the "scene" and partly cause the city is exciting...... (not generalising here, this is a researched fact)
so even if a country becomes really really accepting it will be a rare sight in many rural/township areas.
either which way it will happen, Nordic and Scandinavian countries are well on the way!