I'll be travelling to Camden Town via Highbury & Islington, getting off the tube and getting on the overground, I understand that there is a pink card reader to tap to stop me being charged for a zone 1 fare, now, do I tap the pink reader and the yellow one and is there a pink reader in the tube station or do I just tap the yellow one there?
Tis all very confusing, God knows what tourists must think of it all.
I assume that you meant to type 'Camden Road' because the London Overground doesn't serve Camden Town. (It's only on the Northern Line).
Touch out on the normal card reader at Highbury & Islington Underground station (if you actually encounter one - I don't recall passing one when changing trains there several times last year). Touch in on the pink reader at the London Overground platform.
Camden Road station is no more than 200 yards from Camden Town tube station. Why not just stay on the Victoria Line at H & I as far as King's Cross and get on the Northern Line to Camden Town? Much quicker and no problem with readers.
Then get off the train/Victoria Line at Finsbury Park and get either a 29 or 253 bus from just outside the station. They are about every 3 or 4 minutes and most of the journey is along bus lanes, so it doesn't encounter much traffic congestion.