Ok, so here I am coming towards the end of my 8th straight night shift, 5 of them 12hr shifts and 8 days without caffeine. (Well I don't think I've had any!)
How did it go? I had a couple of days of headaches, not bad ones but just annoying pain apart from Friday. I had something on with Air Cadets during the day and only had about an hour and a half sleep before going back to work at 17-30 and I forgot to take water with me. I went about 10 hours without a drink and by about ten to five my head was banging. I realised my mistake and drank about a litre and a half of water by about 17-40 and the headache was gone.
I have taken on some of the advice and bought a tin of Decaf coffee and had some tonight. It doesn't taste the same as full fat coffee and I think I will have an odd cup of real coffee once or twice a day or even a cup of tea instead.
The upshot of the reduced caffeine intake is that I have noticed my sleep, even in the hot and sunny days, has been deep and relaxing meaning I go to bed, go to sleep and have a solid minimum of 6 hours heavy sleep. I will continue to drink a lot of water as I'm finding I'm not as hungry all the time and my snacking has cut right down. Overall I think it's been a successful experiment and I would like to thank everyone who took time to give advice and share links. Cheers guys