Just thought I'd share fitting of Jack Webb big brake kit to an imperial sv roadsport. I chose them after advice on the forum and Caterham were struggling at the time with Covid supply chain.
Supply was super fast and email response likewise from Jack - V helpful - only thing I needed extra was part number 77209f braided lines from caterham (wish I'd known at time as I would have ordered together.)
Took hub off and re greased bearings too took about 2 hours per side including a major clean up- one hassle was the copper sealing washer for caliper end was a touch big and off centre so didn't seal first time I bulked the thread up with a bit of PTFE tape so it centred perfectly and cinched up well.
Bleeding dead simple and pedal feel and power much nicer than the old 15 year old Girlings. I have retained the original master cylinder after reading the threads on here and it seems A1 and a quality bit of kit..... Now for the track acid test.