hex S power supply

Hardware
1

Hi there, where in the UK can I get a 48-57v power supply for

RB760iGS (hEX S)

2

Try here: https://linitx.com/category/mikrotikpower/196

3

The RB760iGS power needs are between 6 and 24 W.
The latter means at 48V 0.5A.
Searching with these characteristics, + "UK plug" will give you many results, examples:
https://www.wifi-stock.co.uk/details/48v-0-5a-poe-adapter-uk-poe-48v-24w-g-uk.html
https://www.wifi-stock.co.uk/details/ubiquiti-48-vdc-0-5a-gigabit-poe-adapter-poe-48-24w-g.html

4

It is quite common for security systems and other more generic uses.

The connector is "2.1/5.5mm" dc jack, center positive. 20W / 0.4A minimum is good advice.