I've just serviced my shower, to do so involved draining the cold water tank in the loft and turning off both the hot water and cold water supply. After putting the shower back together, I turned the water supply back on and found that there was no water coming out of any hot water tap in the house.. the cold water tank in the loft is now full and there is hot water in the hot water tank, I just cant get it to come out. What should I do? As far as I know, I have turned back on all stop-cocks that I turned off.

Is there a possibility that you have an interconnected hot and cold supply

If this were my call I would go to the first tap closet to the hot water tank and disconnect the hot water raiser. Now turn on the hot water supply valve for a minute. Do you get hot water out of it? Let me know. Tom