(Did my previous comment get eaten? Sorry if this appears twice!)

I’ve used this service for lots of places, including the banks. The 2 places that keep refusing it (and costing me a fortune in the mean time) is the Passport Office and DVLA. They’re both stating it needs to be signed by a solicitor or notary public. Any hints? The amount it’s cost me in postage it’d have been cheaper to pay for a deed poll, but I don’t want to on principle now. DVLA will accept a change of name if my passport changes so I just need the Passport Office to apply their rules consistently.