Heat pump engineers are the best professionals to consult for advice on whether existing home radiators will work with heat pumps.
Heating engineers will be able to identify if your radiators are of sufficient size and provide an adequate enough heat output to work effectively with heat pumps. They can also flag up whether additional heat sources such as heated towel rails will be required, or if an altogether different vice like underfloor heating is preferable.
For further information, take a look at our blog, Will My Existing Radiators Work With A Heat Pump?