Thanks gents, I seem to have discovered I'm a latent OCD, this build thing has become all consuming and sometimes I get blinded by unnecessary minutiae before the 'if it ain't broke' fairy of commonsense pops in for a cuppa. I did get hold of a plug and play led affair from an e marked unit that I thought would do the job but on install the lens pattern of the stock taillight cancelled out any visible enhancement. I have had a chat with the chap on matchlessclueless and he seems keen to fab up some plug and play led boards with new type leds for sohc if enough interest exists, he's doing some for modern 'Bonnie's' that do seem to work well. However, saner minds and all that, I'll probably just stick with the standard filament bulb. Once again. thanks for taking the time. Nick.