Sergey is right, go for a better meter. I have been investigating which one to buy, apparently Kewtech and Fluke are amongst the best. Here is a Kewtech meter that looks good available from a UK store.
http://www.tec-supplies.com/products...a+clamp+meter/
or here
http://www.test-meter.co.uk/products...c-clamp-meter/
there is a more expensive one that also measures true rms current for AC circuits, I'm leaning towards it as it could be useful for circuits around the house.
http://www.test-meter.co.uk/products...c-clamp-meter/
here is another UK shop with a wide selection. Watch out for the AC only ones, there is a lot of them and they wont measure DC.
http://www.testermans.co.uk/clamp-meters