Maplin started because hobbyists couldn't buy from RS etc without being a business or in massive qty. Want a couple of 1k resistors, buy 1000 of them. Maplin would buy from RS type companies and then sell low qty to the customer.
Now that RS and Farnell etc sell direct to hobbyists and in low qty Maplin's original purpose has moved on.
I think also they lost focus. They done what Woolworths done, tried to do everything but ended up becoming a place where you didn't really know why you would go there.
Maplin could have been in a great position to embrace the Maker community. Parts of stores could have been dedicated to offering tools for people to use to make projects, as well as selling the tools as well. Have a bank of 3D printers so people could being in designs have have them made there and then. Small CNC routers for the same purpose. Offering, as they do, kits for arduino or raspberry pi but having the facility to actually build things in store.
Instead they have become a glorified tech shop that doesn't know if it wants to sell toys, dj equipment, smart devices, gimmick trash, batteries, electronic components, computer parts, TV parts or home security systems. They just don't do anything well anymore, it is a hodgepodge of products and categories with nothing that decent being sold or at a price that would make you want to buy it.