Thanks for the replies Rich and Janielle.
With regards to whether I did anything differently from the real test:
1) I did the IR section (score indicated above), though I skipped the AWA. I will obviously practice the writing before, but given the AWA section is half an hour I don't think it's that massive advantage compared to reality?
2) Yes I took it at home (is that good or bad?)
3) Not really - I never paused the test, only took toilet break when it said there would be an official break in the exam and ensured that the break would be shorter than that allowed in the exam. Apart from the AWA above I didn't skip anything.
4) There was a single verbal question I had seen the day before in the OG16 diagnostic test, though I got it correct even in the diagnostic test (newspaper marketing department got restructured and the sales then increased. What would help in determining whether the increase in sales can be attributed to the restructuring).
So I think apart from the AWA skipping I didn't do anything more leniently than on real exam.
My worry is how much variance there is from this practice score to the real thing, i.e. maybe I just got lucky? I could take the second practice test to confirm though that would exhaust what looks like the best source of test there is...