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Yahiroz - no clue. Each of us have tried changing the server from "auto" to "NA/EU 1" as suggested, but it didn't help. Considering we're in Scotland and England, with totally different ISPs, and both tried clearing our caches and stuff, it just seems odd. It's working absolutely fine on a proxy from any country; just to test it, I set the proxy to the UK, and it still wouldn't work.
It seemed odd that on two different UK computers, and a UK proxy, it won't work, but it'll work from other countries (both anecdotally from others and when we use the proxy set to abroad).
This is the series we're working on: https://mangadex.cc/title/19949/kinnikuman-nisei-ultimate-choujin-tag
None of the much older chapters will work at all, except for our American translator or if we use proxies.