I suspect they're on the way out.
I used Maplin a lot back in the 70s and early 80s for components, all mail order. I was probably averaging two orders a week. Of course back then the likes of RS and Farnell wouldn't consider anything other than trade clients along with several references.
In the mid 80s I got a trade account with Farnell, as I was friendly with the Cambridge rep. So I stopped using Maplin. Of course now Farnell and RS will take anybody, as will Digikey and Mouser. So the original Maplin business proposition is defunct. I suspect that's why they went towards kits and audio/visual/computer stuff. There is/was a Maplin shop in Cambridge. Can't remember if I've ever been in it, but if I have it was decades ago.
I've done enough electronics professionally in the day job not to want to do it in my spare time now. If I do need bits I simply order from the professional suppliers.
Of course if Maplin go down the tubes it's part of ones youf gone, but that's life. Forget it and move on. In the early days I was interested in RF and spent quite a lot of money in person, and mail order, with Home Radio and Henry's in London. They're either long since gone, or have changed tack like Maplin.
Andrew
PS: I've just looked, there are two Maplin stores in Cambridge, the original one in the city centre and one a bit further out on a retail park
Edit: Why does one always see a speeling error after posting?
Edited By Andrew Johnston on 20/02/2018 14:07:56