Commercial development opportunity in London - what estate agents to use?

[Kitttty]

Hi we have been left a commercial property in central London and have since achieved planning permission to extent it so that 3 new residential flats can be built whilst retaining the ground floor as commercial premises - although this is on a residential street (used to be a big corner pub).

What sort of estate agency should value and sell it...it would be sold to a developer....dont want to get stitched up - we have no idea what we care doing

Lots to choose from CBRE, Savills, Nelson Bakewell. Where is it?

Thanks Spotty that's really helpful - its in Whitechapel E1