Another test is to bypass the ignition switch circuit by replacing the green control wire (spade connector under the live leads bolted onto the solenoid) with a direct connection to the positive terminal of the battery and seeing if that works better. Use as thick a wire as you have and only flash it to test as the wire won't be able to cope and could melt/catch fire. If it works like this then there could be a problem with the ignition switch wiring. (Thanks to Andy R for this one)
I cured a starting problem last week with a replacement earthing strap, almost undetectable nicks along the side had reduced its capability enough to prevent the starter working consistently.
Good Luck
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