Can I use plasterboard or
hollow wall anchors to hold these tot he wall, or would I be best
finding the studs to "future-proof" it against heavier loads? If so,
can anyone recommend a decent stud detector?


Stud detector. 7 quid in LIDL from Thursday.

http://www.lidl.co.uk/uk/home.nsf/pa...elliSensor.ar2