I investigated this some time ago, offering prizes for anyone beating the records. I think Eddie Bray from malvern came up with the times. (He is the expert in this type of information) but I can't locate the who and when. I'm sure he'd let you know if you're really interested.
Course record he gave me was 19.52 for men and 23.45 for women.
I think Stuart Dangerfield did a faster time on the short distance circuit course.
Would be good to know what our club course records were - ask Sam to lend you the TT records next winter when you've only got turbo work to do!