ˌLondon ˈweighting BrE AmE noun [uncountable]
money added to the income of someone working in London, because of the higher cost of living there than in the rest of the UK:
He earns £35,000 with London weighting.
LONDON WEIGHTING
Meaning of LONDON WEIGHTING in English
Longman Dictionary of Contemporary English. Longman - Словарь современного английского языка. 2012