Heat pumps will tend to run continuously as that is the most efficient way to operate. 10kw per hour seems excessive. My heat pump  runs at about 1kw per hour in a 5 bed house at 5 degrees external temperature. My system uses radiators which should be less efficient than underfloor heating. I would say something is wrong if you're using that much power constantly.

Are you sure you're looking at the input power and not the output power. 10kw sounds more like the output power. For input power you should check the meter or smart meter.

I just looked at the memter again and currently sitting at 3kw per hour average over last 5 hours.

only have standard household appliances running so confident that is the main source of power usage.

That is a lot less than 10kw per hour and more like what you should be seeing. I don't know the size your property, it's insulation or your set temperature. But if your set temperature is say 21-22°c and your insulation is not great that power usage might be right.

My house is quite well insulated and set temperature is, 19

-19.5°c. You will see a spike in power during water heating.

Do you have a smart meter ​@gdebruin if you have half hour readings that will help to see the pattern of your heating plus other equipment.

Can you explain a bit more about your setup. Photos would help too please.

Also what kind of outside and inside temperatures are you talking about ?

the temp outside today was about 2-4 deg. inside I set it to 21 for under floor heating which is downstairs.  and then a second zone with radiators throughout 5 bedrooms upstairs is set to 20.  i will look at the 30 min readings as I have a smart reader but not really sure how to do this.  

I would guess about 250 sqm size property.  upstairs is one zone with the radiators and downstairs is the other zone with underfloor heating.  Property build about 5 years back so very well insulated in my opinion but it is a big place

A constant 3kwh would not suprise me 10kwh constant sounds high. Can you get figures for daily and weekly electricity consumption.

You should be able to see your half hourly usage on your energy supplier’s app. I’m with octopus, this is my usage graph for 11th dec. I have battery storage so you can see a big gap where the house was running on the battery most of the day. It is charged up during the cheaper rate window from 23:30 to 05:30

More usefully I have a monitoring system which shows exactly what the heat pump is doing. This graph is also 11th dec. The spikes are hot water heat ups. I have been running it 24/7 too. Our bungalow is 99m2, with 7 radiators, heated to 21/22 degC , it was around 7degC outside on the 11th and it used 18 kWh.

Can you see what your flow temperature is ? There will possibly be two, one for each zone.