Good morning, and welcome from a fellow UK-er!
Well, Harry was quite dark when we got him at 12 weeks, but got paler and paler over time....(+ bigger and bigger....!!!
)
One of our members here, Oddsock, also lives in Yorkshire with her 2 adorable pups - it might be worth messaging her to see if she could help at all?
But if you definitely want a small, dark dog - I personally would look into other options just to be absolutely sure
Good luck!