I wouldn't count on the stud detection on that being very good.

Go to your local B&Q's hand tools section (near the spirit levels etc)
and get yourself a stud detector that looks like this (costs about
£16):

http://www.zircon.com/SellPages/Scan...Spro/SSPro.jpg

As a stud detector it's superb but unfortunately it doesn't have live
wire/copper detector but you could get a good one those separately and
they're not too expensive.