Leonards stores at Billingham, Hartlepool, Ferryhill, Ayclliffe and Sunderland have all closed their doors in the last few years. The store at Spennymoor has changed its name and sells other goods now.
If you need to get in touch with the company that owned Leonards Electricals you need to contact
THE Smart Corporation Ltd
There is no customer facing contact there, hence no point in looking for a telephone number.
I went for a meal with fellow ex-employees just before Christmas 2014 when the last branch closed.
At the point of writing I am the only one remaining working with electrical products.
If I can be of assistance please drop me a line.
David Everitt email@example.com
Many independent retailers are part of a buying group called Euronics -http://www.euronics.co.uk/ I would always recommend you check their prices and service.
They nearly always offer better packages than the nationals : -