They have a range of funds in GBP in the United Kingdom, because the retirement system there is similar to the US. That's all.
There is a handful of funds in EUR through an European subsidiary, but it's laughable compared to what is available in the US and they are pretty hard to buy.
Someone looking for exposure to Europe could get that through one of the Vanguard FTSE Developed Europe funds - they’re available including or excluding UK and in accumulating or distributing versions.
Very easy to buy just submit an order on the market. I personally use Interactive Brokers and buy on London Stock Exchange but any broker that gives you access to one of the major European exchanges should do.
Vanguard as well as iShares (Blackrock) funds are readily available in Europe unless you are looking for niche stuff. But then there also is Xtrackers, Lyxor, HSBC, .. which offern funds based on the famous and not so famous indices.
They have a range of funds in GBP in the United Kingdom, because the retirement system there is similar to the US. That's all.
There is a handful of funds in EUR through an European subsidiary, but it's laughable compared to what is available in the US and they are pretty hard to buy.