£28.95 with VAT and delivery
Oh! Ic How about this one https://www.its.co.uk/pd/OMU25134SL-240v-25m-4-Socket-13A-Open-Cable-Reel-_MASOMU25134SL.htm
That's only a 2 gang version unfortunately, although does have the USB ports.
Screwfix £24.99 https://www.screwfix.com/p/pro-xt-13a-2-gang-25m-cable-reel-2-1a-2g-usb-charger-240v/4728x
“I’m Convinced my neighbours have one of these plugged into my electric supply somewhere, just not managed to catch them in the act yet” (excited)