OK, This is very embarrissing.
I had the fuel lines on the wrong way around
I fitted a fuel pressure gauge and was not getting any fuel pressure. So I figured maybe its the pump or the regulator. I got on the phone to my brother in law (a mechanic) and was discussing the possible causes with him. Something he said made me say "imagine if I had the fuel lines on the wrong way around"
Then I asked "should the fuel go to the regulator on the way in or the way out", he replied "usually on the way out". I said "Oh dear"(or words to that effect)
. I swapped the fuel lines over and it started straight away.
Thanks to everybody who helped. Just in case anybody is interested, below is a picture of my new fuel pressure gauge.
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