L n S
Yes I know RF quite well. It used to be based at EMA, where I worked for many years. I think it arrived the same year as I did (1981). Always seemed to be a bit of a fixture around the place.
It was kept in the Flying Club hangar, so I have sat in it a couple of times.
The chap who is converting me to fly my Aiglet used to do the C of A renewal air tests. I know he has looped it and rolled it, but he says you tend to run out of sky quite quickly
Has a bit of history to, which I am sure you already know.