Sorry this goes on a bit but it might be of help to others who are thinking of changing their harnesses, if not you can always move on Well this turned out to be a lot more involved, not to mention expensive than I originally envisaged. Thanks to everyone who offered help, recommendations, advice and even sent me spec sheets of their set ups, that was very helpful. I was adamant pull down was the answer to my problems, how wrong was I? A helpful local owner suggested I tried his S3 with that set up, the result was bruised ribs for my passenger and the frustration of having to keep getting out of the car to re attach the half door. What was needed was a longer strap between the mounting & the adjuster on the lap strap to clear the slot in the Tilletts. So to cut a long story short I am keeping with pull up, I looked at all the leading brands and it was between the Schroth & the TRS in the end & upon close inspection, without doubt the best quality (& most expensive), were the Schorth harnesses, softer webbing, neat small buckles which are removable (see image below) in seconds for fitting & cleaning the belts, a really clever idea IMO & smoother adjusters, they really are a great bit of kit and I notice that Caterham recommend them for race cars. Demon Tweeks stock the Schroth Caterham II ASM Harness and Dave Kimberly was very helpful and patient when I bombarded with all my stupid questions. Bit of a tip if you’re a cheapskate like me, I wanted 6 point which was an additional £180 for the pair so I took a punt and left the crutch straps off the order and . . . . . . . . . lo and behold, my old Luke crutch straps fit perfectly in the lower buckle slot. With regard to the Luke harnesses which I have put up with 2 sets for 20+ years, they really are naff compared with what’s readily available today, the buckles are large and cumbersome, as are the adjusters that really are not fit for purpose & make adjusting in either direction a right pain. It’s as if Luke have a product that sells and cannot be bothered or see fit to improve upon it. Well that's it, thanks again BlatChat and here is the removable buckle - Guy