From memory it was probably the Bath Road course, Bath is far too hilly.
Down the A4 and turn before Marlborough, back up nearly to Reading and across to Oxford etc.
I thought the straight out 100 was with a strong following wind. He worked for Raleigh, and used a Sturmey Archer close ratio fixed with gears around 100.
My memory could be faulty, but he was certainly very much admired.
Correct. The 100 course (when I rode it in 1968) started in Pangbourne Lane on the A4 West of Reading (now disappeared with new road building) and went North up towards Oxford to turn and retrace through Pangbourne Lane (approx. 50 miles) and then up the A4 through Newbury and Hungerford to turn again as Keith says and finish in Pangbourne Lane. By today's standards not an easy course with Speen Hill etc. on it. I rode it as a 100 only once but packed at around 80 miles as I realised I was getting slower and slower! When you go down those roads today it is difficult to grasp how fast they were for TT'ing BITD (eg, the first 'inside 1-50-00 50 mile' by Pete Smith in 1967 in the 'International 50').
The RRA 100 was straight out with wind as you say - but I don't think he worked for Raleigh but, being in Nottingham, he had a close relationship with them. He worked in electronics with Ericsson and then Westinghouse and was heavily involved in the design and installation of the Hump Shunting Yards for British Railways in several locations in the UK - including Wakefield as I found out when I was lucky enough to meet him 18 months ago at a dinner.
A very nice pleasant man and easy to chat to.
Today is the yesterday of tomorrow.