I used maps.google.co.uk to find the places marked by the co-ordinates. Because of the particular type of cache it was, all the co-ordinates were listed for the intermediate places, so I then marked them all with pushpins on local.live.com and printed out a map with pushpins. Maybe it was a puzzle rather than a multi... I'm not sure gotta get the hang of this lingo!
It's probably not the best way of doing it, but it saves investing a fair chunk of money in a hobby before I've even tried it (been there, done that, would rather avoid it in future!) and at least here (Central London) the co-ordinates and map seem to match up pretty closely, so I had no trouble finding the 5 locations I did yesterday, anyway.