I need to reduce the pressure in a mixer tap.

[Fluffycloudland77]

It’s got two speeds, off and full pelt water everywhere. How do I get it to be a normal tap?.

It’s a rectangular tap so tap inserts are out.

Is there an isolator valve fitted to the supply pipe? If so you can use a flat head screwdriver to turn it partly off and reduce the flow that way.

Possibly, it’s concealed fitting so it’s a pain to get to.

Guests complain when it soaks them.

Is your water pressure excessively high in general or is it just that tap?
If it's all high you should get a pressure reducing valve fitted, if it's just a rubbish tap you can either change it or reduce the pressure of that one tap. Or even add a stop tap before it and turn it partly off.
Those slot valves are designed to be fully on or fully off, so beware in mind that doing it that way is not recommended by the manufacturer.

No it’s perfectly normal everywhere except this one tap. It’s a Bristan Pisa mixer tap same as the others.

It’s just rather enthusiastic.

I have this problem with a tap in the futility. I think it’s cos it’s downstairs where most pressure is.

This is what I don’t understand, the kitchen, outside, utility are all fine.

I’m hoping someone has the solution!

Are there taps made specifically to deal with lowering pressure? I have checked and can’t find a isolater valve on the pipework.

you can get a pressure reducing valve, Caleffi is a popular brand.

If hot and cold are different pressures, you can get one that reduces the cold so it matches the hot. They are sometimes used on showers. They connect to both the hot and cold pipes so they can balance them dynamically.

Hot and cold are both too high.

Just to add a bit more info, if you fit a stop tap (or turn the slot valve half way) then you will reduce the maximum flow but the pressure will stay the same.
If you use a pressure reducing valve, it will reduce the whole range of the tap but still allow you to vary the flow.
For a whole house that would be essential otherwise you couldn't use a tap when the toilet was filling, for example. But for one tap it's less critical the difference

We've got one of those valves by the hot water tank.

photo please

and of the pipework to show what it's doing