clive12345,
Dont talk rubbish. "double the price or more" - "very time consuming"? Its a perfectly ordinary job. The "features" - skirting, rail & cove are useful datums to an experienced plasterer who can prep, scratch, float & skim.
Lead Farmer,
Yes, a plasterer would be happy to do the job as is.
Carefully clean all the edges of the woodwork and the cove - use a utility knife.
You could remove the rad brackets but leave the screws in the plugs. No need to remove anything else.
You could take out the suction from that dry background by applying one or two coats of
5:1 water : PVA - the plasterer will later PVA a tacky coat on top.
Isolate elec before PVA'ing.
Wipe off any PVA on woodwork.
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Ree - ":" followed by "P" makes an icon like this

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