There are a number of Hobby motorhome dealers located across the UK and Ireland.
A quick Google search for them along with the county you live in should give you a list of potential dealers.
If you are looking for a list of used Hobby motorhome dealers, I would recommend contacting the manufacturer directly who should be able to help you find an approved used motorhome dealership in your area.
Alternatively, in the back of the new motorhome brochure there is a list of approved Hobby dealers, along with their contact details and website addresses.
All of the dealers listed in the brochure have an online catalogue of their current and expected stock on their respective websites.