Hi Trevor,
Thanks for the link. I had a look at it, and tried the truss rod again but I am just too scared to put too much force into the adjustment. I am already applying a fair amount of pressure. I looked up as many setup figures as I could find and interestingly all the figures on the TL are in the ballpark - except for the relief. I chased up more neck adjustment video's and found two that apply physical force to the neck to adjust it so I have gone down that route.
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Its been sitting like that for about 6 hours, so before I go to bed I'll tension the strings and keep my fingers crossed for the morning check.