I have now received the Goldtech chainring from BETD, very prompt dispatched Tuesday and here the next day, so being free for half an hour fitted it. It is a simple job as there was no need to remove the bottom bracket and adjust the front derailleur. Simplicity does have its merits. I do need to work at getting the chainretention device to fit cleanly though. I think over the rougher downhill sections it will save me from spinning my legs in a futile attempt to provide drive when required.