It was the coil pack breaking down.....inside the cups for the ht leads was covered in moisture. Must have happened on the wet drive back from F.I.T.P.
Engine bay was dry as....... Swapped it over with a spare I had kicking about, like a new car!!! For some time now I used to get in it and think damn this is sluggish then others I`d floor it and it would be rapid. Must have been breaking down when it was damp/hot

Jobs a good`un though