On reading the letter from Marc Hanson I felt I should respond to his assertions.
The RICS Contracts in Use survey was based on a small unrepresentative sample. Perhaps, as a member of the JCT, the RICS is attempting to use statistics to support the case that JCT is more popular than NEC/ECC.

NEC is now used on a large number of civil engineering projects (I estimate 75%). Now that clients are seeing the benefits of the NEC family of contracts, they are also converting. Many big spending clients wish to see proactive management of risk, as well as the speedy agreement of change.

To paraphrase Sir Michael Latham "if you wish to carry on using solicitors to close out your final accounts, continue using JCT".

Postscript

Robin Wilkin, director, Needlemans MPS, via email.