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You could just get something like this - https://www.amazon.co.uk/AUKEY-Charger-Delivery-MacBook-Nintendo/dp/B07CPLRTSJ/ref=pd_sbs_107_6/261-7030143-9485961?_encoding=UTF8&pd_rd_i=B07CPLRTSJ&pd_rd_r=aea32d71-57b4-11e9-afc1-6daec49bb716&pd_rd_w=BBBSL&pd_rd_wg=hxeuy&pf_rd_p=18edf98b-139a-41ee-bb40-d725dd59d1d3&pf_rd_r=V5T587MNPMVX50BDD1P7&psc=1&refRID=V5T587MNPMVX50BDD1P7 obv the EU 2 prong version, and then buy a usb c-c 3.0 power delivery cable? I'm thinking of doing this actually.

I use this one

https://www.amazon.ca/gp/product/B07CPLRTSJ/ref=ppx_yo_dt_b_asin_title_o01_s00?ie=UTF8&psc=1

Not the cheapest nor the smallest but good quality PD charger and you get 2 additional ports to recharge phones and other devices.

I’ve been using the AUKEY USB-C Wall charger (56.5W) from Amazon, link (www.amazon.co.uk/dp/B07CPLRTSJ) and the Belkin Boost USB-C Cable from the Apple store. I’ve been using both together since day 1 of my iPhone XS Max (8 months) and so far my battery health is still 100%.

I've used the Aukey charger on that list for several months now without issue, and it's been good for my phone too.
Basically you'd want any charger from a reputable brand the supports ~60W (similar to the included Huawei charger) should be fine.

I recently bought this charger, works fine with the laptop, doesnt come with the USB C cable though. https://www.amazon.co.uk/dp/B07CPLRTSJ/ref=cm_sw_r_cp_awdb_t1_DBb0CbX49WG2M

Any charger with a UK plug should work in theory though as usually they'll be designed for the UK outlet spec