Hi Andrew
Firstly many thanks for your help and advise prior to the supply of the above unit. As promised I am reporting back on the installation.

Firstly, idiot proof install - even I could cope.
Secondly, although I am no Jeremy Clarkson, noticeable increase in power and acceleration.
Thirdly, seems to have removed all flat spots, therefore immediate response when required.
And finally, it seems to me that the engine runs more smoothly.
Anyway very satisfied, looking forward to towing the caravan in due course, sure it will be an improvement.
Again many thanks for your support.
Best regards
Roy