Many thanks for reply John .The full story is that when the jag went into limp mode whilst in Dover ,the closest garage was Halfords and they did a diagnostics .See attached .They recommended me to see an auto electrician , not could really tell me the fault .I was recommended by a friend to a mechanic whilst still in Kent and he came around .I showed him the codes from Halfords and he checked the car and removed plugs and said it's water ingress causing problems .He took the car to his place in Chilham ,changed plugs and coils and did diagnostics and he said different codes came up .After doing further tests said 4 and 6 cylinder low compression.I'm back in Surrey and need to go back and sort it out .He recommended me selling it or putting in reconditioned engine .