Hi all, thanks for the advice. Had a look at the esc's they are blown. With further investigation I have found they where sold as 6s compatible however, they are actually 4s.... they also should have had an over voltage protection to them... anyway, motors are still good, so bought a couple of quicrun 880 esc's and running bot on 4s lipo's. So all should be good... fingers crossed.
Later once I've proven bot design after Grantham, I shall upgrade motors, batteries and esc's.
Hope to see you there. Cliff.