RIBA – Client's advisory service - www.architecture.com
The Royal Institute of British Architects is one of the first ports of contact should you have any general queries. We would also refer you to their leaflets on Why Use an Architect.

Structural Engineers
Osborne-Edwards Engineers - 0207 226 2444

Landscape Designers
Philip Nixon – who won the Gold Medal and best in category at Chelsea (2005) - 0207 371 0066
http://www.philipnixondesign.com/