Tech shopping in London

Hi

I will be in London for 6 and 7th February. It seems tech prices are cheaper there than here (charms a tech freak like me :) )

can someone tell me some big tech markets names please? My first target is ps4 pro as there is none left here. Also some markets with online shopping sites would help me to have clue about prices.

Tottenham Court Road, near the junction with Oxford Street has a lot of tech shops.

Isn't there any big and more trustable stores? like Media Markt maybe..

There are also 'big name' stores and reputable department stores on Oxford St.  Selfriges, for example has a good tech department, but very expensive.  Am not familiar with Media Market.