Throughout the brewday I was as pedantic as I am at work, and the results were close to what was expected. I did find that my evaporation rate didn't concur with the Calculator. I had more in my boiler at a lower OG than expected (1.046 instead of 1.048)but I am very happy with the results. I got 21 litres into the FV.
Todays figures show where I went wrong last time. So lessons learnt.
Thanks for all your help, guys. Your feedback and info was what pointed out possible areas for improvement.
This result was down to you.