
Hi,
Not sure where you are in Yorkshire, but I train with the Tailwagger club, who do classes around Leeds, Harrogate, Otley, etc. The trainers are very good, and can arrange one-to-one sessions. I also know they offer beginner obedience classes especially for older dogs that have problems like you're describing. I'll post the link below, but it may be removed (not sure if these kind of links are allowed), it it's not here PM me and I'll send you a link/phone number.
Good luck!
Clare
http://www.tailwaggerclub.co.uk/