No water coming out of any hot taps?

Hi,

There isnt any hot water coming out of any of our taps this morning.

Yesterday I fitted a new mixer tap in the kitchen and everything seemed to be working fine, although it did look like there was a little less hot water coming out of the new mixer than the old.

One thing I did wrong was to connect the hot and cold pipes from the mixer the wrong way. Should this matter?

As I say, I have tried all the hot taps in the house and there is no hot water coming out at all.

We have the following:

1. Ideal Mexico Boiler
2. Honeywell Cylinder Thermostat L641A1039


The cold water is fine

Any help gratefully appreciated

Thanks

Alexandra