Welcome to immigrationboards.com!
Spain VAC London wrote:A Schengen visa has to be obtained from the Embassy of the country where the MAIN PURPOSE OF TRAVEL lies. Therefore, please check your travel plans before applying at the Spain Visa Application Centre in London.
And likewise for all Schengen countries.France in the UK wrote:You may obtain a visa from this office if:
You are spending more time in France than in any other Schengen country during the same trip
You are spending the same amount of time in France as in the other Schengen country(ies) and are entering France first, during the same trip
The decision and the validity of the visa will be based on your itinerary after study of your application.