I have ordered quite a few things from McMaster-Carr, and they give good service.
And I have used a lot of their 2D and 3D models that can be downloaded for many of their parts.
Never had a problem with them (I am in the US).
I have ordered things from the UK, mainly such as books, but also some equipment, and had good luck with that too, but it takes a while when you cross borders, and a VAT-type fee generally will kick in one way or another.
.