If anyone interested. At Lidl today, mains power electric vehicle polisher with four polishing pads. £19.99 Comes with a three year guarantee. Haven't used it yet but it looks a well made piece of kit. A lot cheaper than Halfords.
I tried using one of thos oscillating polishers on the front and rear GRP panels on the MH with little success.
The Lidl high speed angle grinder come polisher was the way to go, and gave the best results quickly, but has to be used on a "LOW SPEED"