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Thanks, your last point is the thing we are arguing about, if in tier 2 you can't have anyone stay then in theory they shouldn't come.
CanonAxe-
The bottom of this page is a list of exemptions to rules on "gatherings" which would appear to be a broad term for all the rules stopping you seeing people in certain settings.
The list of exemptions doesn't include allowing people who have travelled into the country to self isolate with you.
However the self isolation travel advice page , while saying you can self isolate with family members, also then says:
There may be other restrictions on indoor and outdoor gatherings with people from outside your household under the national rules that apply
from 5 November. You should ensure you are complying with those rules
as well.So its clear as mud really. As others have said, if you're looking to bend that many rules, the answer is probably that you would all be better off giving a miss this year.
Also, do you really want another family, including children, trapped in your house for 14 days while you can't even pop out to the pub?
Scrabble
Saudi Arabia is not on the safe travel list, so they would be subject to 14 days self isolation on arrival regardless of any other Christmas relaxation.
Looks like they are allowed to self isolate with family and friends on arrival if that is where they are staying, but means no one else can visit.
I'm not sure where that advice falls in relation to tier 2 restrictions which suggest you can't have anyone to visit.