Tipping customs help???

I'm about to go to Scotland for a funeral. I'm wondering what the norm is
there.

I'll be in the highlands, arrive via Glasgow. I don't know how much eating
out, or other sort of services I'll use (staying at a family home with only
perhaps one hotel night), but this thread has me wondering who I'd offend
with my normal generous tipping (several of Lydia's family are in the
hospitality biz so I have a better perspective than most of what they go
through and how little they make, even in an alcohol establishment). I'll
be taking a shuttle to the rental car and back to the airport, for example,
and may be forced into skycap service (don't know how it works over there),
when I'd ordinarily take them to the counter myself, that kind of thing.

Anyone know??

L8R

Skip (and Lydia), gone for a couple weeks Wednesday