In order to buy myself a good pair of running shoes, i dont have access to any specialist shops etc to test my running style, so is there a reasonably neutral type of trainer i should be looking for, or one i should avoid?
Look at the way your current pairs of trainers wear down. If they wear predominately on the outside of your foot you under-pronate. If your trainers wear down on the inside of your foot you over-pronate. Over-pronating feet require good arch support, so look for trainers that offer good arch support or invest in a decent set of orthotic insoles.
Another simple test to check what kind of foot you have is to follow this guide (Admittedly it's very ball-park but its a step in the right direction) No bloody pun intended : http://www.runnersworld.ltd.uk/foottype.htm