is this for one room or a whole house?
Generally you can do a consultation for 2 hours which would be around £250-£300 – the designer would listen to your concerns / ideas / wish list & give you ideas and advice and then just confirm what you’ve spoken about via email but no design plans
Or you could have an E- Design package consultation which includes a one and half hour zoom call and the designer then usually offers 3 detailed designs based on your conversation and room/ house (takes a few weeks ) and this usually starts from around £1250
Good luck !