The first picture shows a very festive Harrow-On-The-Hill station. In the glass, where the Xmas tree is, can be seen a reflection of "Platform 3 Watford". Of the three stations which a) have three platforms or more and b) regularly serve Watford station, there is only one which would have a Northbound platform on the Met line for number 3.
Those attending Harrow School:
tangy
moley
Starkey7
Those attending Harrow Comp:
Nobody. All answers were correct.
The other picture wasn't actually anywhere on the LU network, but instead was a window display at the Selfridge store along Oxford Street - hence not adding it as an official answer.
Prada:
Sam
moley
Primark:
Starkey7 (Bank)
Holder of the slowest recorded 274 attempt: 4 months, 1 day, 9 hours, 17 minutes, 32 seconds.