Excellent, thanks Jim. That line above sums up precisely what I was after too.
My conclusion is that it's probably not worth me making the switch to DOT5 in the Rover unless I can be bothered to replace the seals in the servo (I've already done most of the others). I think I'll give it a miss this time. I also suspect that the Rover will be harder to bleed than my Triumph, which would complicate things further. Thanks all, again.