Hi, welcome to the forum, and your first step on the journey to getting a heat pump!
I’m guessing you mean a heat loss of 9,187 W at design temperature, and a 11 kW heat pump?
Looking at similar sized properties on HeatpumpMonitor.org, this seems consistent with them:
This particular system in Basingstoke may be quite similar to yours and has data for the past year.
This also seems pretty reasonable.
Do you have gas usage for previous years for your property to compare against?