Just to thank everyone in this post, i went though the recommendations to remove the extra devices and was still getting significant performance issues.
I have subsequently moved my hub to a different area of the house - well away from the other electronics and wifi devices and now all mains devices are 100kps, most of which are blue in respect to connecting to the hub - and the lock performance has been reliable ever since with a much lower ms reported in the logs.
Simply put if you have tried everything else - move your hub!
