As you asking for the names of the colleges or universities of London /UK that offered MBA without the GMAT Score let me tell you that as per my knowledge the GMAT is mandatory for getting Admission into the top business schools or universities of London

Admission requirements:
transcript of grades from each university you have attended
your GMAT score
proof of your English Language ability

here I may found the universities of UK that offered the MBA As online mode without the GMAT Score the names of the universities or colleges are given below:

Durham Business School (UK),
. University of Edinburgh (UK),
University of Glasgow (UK),
. University of Kent (UK)
Grenoble Ecole de Management in France,
TiasNimbas in Netherlands
University of Solvay in Belgium