To send the multimeter to the UK would probably not cost more than $5. I lived overseas for 20 years and sent tons of stuff back and forth. I used to use a rate called 'small packet'. It may not still be in use but it was for items less than 1 kg. There used to be a book rate that was cheap.
If you send me about $30 or equiv. and I will send you one and the change. E-mail me if you are interested.