I've just taken out a motorhome hire with Motorholme (
http://motorholme.co.uk/), and it looks from the veritable mountain of confirmation emails, that "Unbeatable Hire" & "Hire Booking Centre" are other companies in the same group.
They also all quote 0800 for sales enquiries, but all the post-sales and support numbers are 0845. I've asked them for 01/02/03 equivalents and pointed out their breach of the various regulations - but in the meantime done a bit of digging round.
One interesting thing, is that non-compliance seems to be widespread among some of the bigger firms - Hertz & Europcar also breaching regulations on several levels, as best I can make out.
I can't see any exemption (to "must publish service charge" or "must provide standard rate number") for vehicle hire firms, and can't find any unpublished 01/02/03 for Unbeatable Hire..
This may yet end up with a report to the appropriate regulators I fear.