3 months ago, I needed to figure out how to get the UK government to tell a multinational's pension service managers that I am not subject to taxation on a 35 year old pension plan because I am a US tax resident. It involves first getting the US government to certify my residency to the UK. If that's not niche, I don't know what is.

Google was excellent, the process took me about 2-3 hours to get everything clear in my head, the documents went off in the mail, and the certification has been issued in the UK.

So yeah, I don't know what your experience is, but it's not mine.