I got one for the Mrs in Homebase of all places. 100dB +, so quite loud, and small enough to be placed in the hand - doubles as a key ring too. About 10 quid.
There is a Maplin shop across the road from where I work. I got one yesterday for £2.99 that was 105dB. Tried it out last night and I could hardly hear it when 40 yards away. I've ordered a 135dB one which I should have by Friday. It is £7.99 and has a torch on it as well.
Personal alarms by Maplin are an option and I've found if you Google WE Alarms who are a UK manufacturer provide them direct which seem to be the best value I've found on the net. wealarms.co.uk
Comments
Contact the local constabulary and ask to speak to your crime prevention officer who should be able to point you in the right direction.
I'm going to buy one (just as soon as I get round to it!). Maybe Santa will bring me one...
Creamcake (CC)
Used it a few times, but was always accidentally setting it off by clutching it in the wrong way whilst running. It's been in a drawer ever since.
good luck though!