I wish there was a bit more overlap between US and UK writing supplies. For some reason, certain Japanese pen companies will sell Pen A in the US only, while having Pen B for European markets. Eg. Pilot C4 0.25, you can still only find it from one small boutique seller in the UK (at one point I thought I bought all of their stock of 025).

I had to order notebooks with Tomoe River 52g paper (well, “had to”…) from JetPens some years ago, as no one in the UK had them. (The situation has improved somewhat in recent years, on both fronts)