Honestly, I'd stop using YVH for imported hops, they're so, so expensive and no matter who you buy from, you're always getting the cuts that nobody in Europe wanted--so why pay through the nose for YVH imported hops? MoreBeer, B3, whatever they are these days are frequently cheaper and often *much* better.
Personally, I really like Hops Direct. They're cheap (provided you're confident to go really big on an order) and I like their quality vs. YVH for imported stuff. For domestic stuff, YVH is quite good...but it always seems like it's cheaper elsewhere and I've not noticed YVH being better quality.
They are much better at marketing, I'll give them that.
Regarding UK Goldings vs EKGs, I can't offer anything useful. When I first started brewing they were just Goldings, not UK, not East Kent. Just Goldings. Once I got my swill tasting good, Kent Goldings were a thing, then EKGs became a thing and I've never looked back.
Not sure if that's useful, but that's the extent of what I know...for what it's worth.