Further confirmation about there being no need to declare participation on a speed awareness course,
'The Consumer Insurance (Disclosure and Representations) Act 2012, came into force on 6 April 2013. This Act modifies the old common law rule that insurance policies are contracts “of the utmost good faith”, which obliged people to disclose information which might be relevant, even if it had not been requested. Under the Act, members of the public taking out insurance for mainly non business purposes, but which includes a private car policy with Class 1 business use, no longer need to try to guess what an insurer might want to know. Instead they only have to supply what is requested, either when taking out a Policy or when something changes during the life of a policy. So, unless the question regarding NDORS course attendance and completion is specifically asked at the time of making the proposal, or at any other time during the lifetime of the policy, there is no obligation whatsoever on a driver who has completed an NDORS course to disclose this to the insurers. However, as always, the detail is in the small print.'
SIRORACLE mentioned 'utmost good faith' previously but even that was done away with as also mentioned above.