Limited? your joking right, as Ive said before, Canadians can only dream about how much hunting is available in the UK, and its cheap
I was surprised at the amount of hunting available, but "cheap" is a relative term.
Compared to you coming here and hiring a guide, it is definitely low cost. However, comparing the cost of "resident" hunting is like comparing apples and ostriches; $200 CAD can buy a Canadian resident as many days of hunting (in their home province) as they can afford to miss work, but relatively few ungulates in a year. As many coyotes, wolves, foxes and rabbits as you want.
Britain is "pay-to-play" everywhere, but you might have the opportunity to take 2, 3 or 6 deer in a day, but then you often have to pay additional to take any meat home.
In Alberta a $25 permit gets you 6 weeks of pheasant hunting, 2/day and 6 in your possession. Britain, for $25,000 CAD you and 7 friends can shoot 400 pheasants in a day.
Like I said, comparing whales and wheat.
As for getting skulls home, as long as they are boiled out, you are unlikely to have a problem. As none of the deer species in the UK are rare/endangered I prefer the 'easier to ask forgiveness than permission' method.
I put my 2 roe skulls in a cardboard box, with some other souvenirs, tied some twine around it and threw it in checked baggage. No one asked what was in the box. CBSA was more interested in the Scotch and Pim's.