Maybe one cheap solution, depending on the accuracy and minimum value you want to read, the Uni-T UT61E. Being a 22,000 count meter it will read down to 10 milliohms. Granted the accuracy will be horrible down that low, but it gets you reasonable accuracy at 1ohm. ±0.5% +10 digits. It is a reasonable meter for almost any use too except higher than 250V for around $60USD. I am sure it is available in the UK or online shipped to the UK. dealextreme.com has it.
Another more expensive option might be a Brymen 50,000 count meter. A Brymen BM857A can be had for around $110 EU and will again read down to 10 milliohm but with accuracy on ±0.1% +6D. It is also a much better meter in every other aspect compared to any Uni-T for build and safety.
If you want REAL accuracy in the milliohm range, well be prepared to watch ebay for the random bargain in a 6.5 or more used bench meter, or spend some big money.