On neogaf someone said over 166k.
Not sure if thats right but thats alot in the UK for a opening week.
f.eks:
[Week 47, 2009] NEW SUPER MARIO BROS. WII (NINTENDO) - 79,000 / NEW
[Week 23, 2010] SUPER MARIO GALAXY 2 (NINTENDO) - 77,000 / NEW
[Week 46, 2009] SUPER MARIO GALAXY (NINTENDO) - No Data less than 100k
To people downplaying this, this is bigger than most Mario Game launches are in the UK.







