New battery to engine ground cable fitted, RHD vehicles need 150cm length with 6.5 and 10.3 flat ring terminals. A 170 amp 10.6mm dia cable can be had from Electrical Car Services for £18.38 + postage + VAT. You will also need an E16 socket to remove the bell housing bolt. I located a parasitic battery drain which turned out to be the radio......easily delt with by pulling the fuse. Could never figure out why the radio used to come on on its own when ignition was first switched on.
Still no joy on getting rid of ABS/BAS/ESP dash lights, plus spoiler has a mind of its own. Speedo now works AOK.