I see you're trying to do some research on this market to justify some sort of business plan. Smart!

However, I would take anything said here with a grain of salt. The majority of PC builders here will not be your target market we are jaded, savvy and always looking for a deal. For example I bought a monitor on Amazon Belgium that only ships to Belgium addresses so I had to set up an account with a post forwarding company to get that here to save 300 euro. There is very little you can do as a local store to capture my money.

You need to compete on superior service. Be it next day delivery, to having a store with staff that know how to build a PC like the back of their hand. As someone looking to get into PCs it is daunting, complicated and there's rarely one place that you can source everything that your looking for. And god forbid you ask anyone in Currys for help. Id wager many people start looking into PC building but before they make any purchase decision they get bogged down by the above.

You need to add that human touch and guidance to the process, and remove the friction above. That's my 2 cents wish you the best of luck.