I can back that up. Kev and I have insured our 'fleets' with R-H for many years. They are also sympathetic to modified classic cars, as long as the modifications are of the 'period'. When Clive Forder, the original owner of my Supercharged 1000SR contacted them on my advice, they did him a really good deal with only a slight 'loading' for its extra boost. Mick
Just used them for my 1100 - very good and they will get my buggy too.
Tried who I normally use (for the last 5 years) and they came back and said no one was interested because of the modifications. Did question why seeing as how the buggy is a bath tub with a full race 2.1 in the back and they did not answer - think it was a case of simply could not be arsed.