First of all thanks very much for taking the time to reply, I don't deserve it, I am a dullard!
Paul AH you are absolutely correct I have somehow bought the varnish for acrylic not enamel as required. Sometimes you can spend ages trying to work something out and it's staring you in the face all the time. My only defence is that the other 2 tins I bought at the same time, (matt and satin) are correct. Anyway lesson learnt on that front.
Of course though it does lead to the inevitable question; is there a fix, especially a quick one? I fear not and the use of fine grade paper will be required.
In all honesty this was a revision/re-learning attempt at modelling, so I could just finish it as is, and use the remainder to practice the various techniques now available?
Interestingly though the damage only effected the matt finish, not the Extra DSG which is a Humbrol satin.
Would anyone recommend the Humbrol clear cote which I've just seen mentioned as an alternative, I will be brush coating though?
Thanks again,
Billy