Ultra-portable mouse with a "plug-and-forget" nano USB receiver.
Not the cheapest, but probably one of the best wireless mice around at the moment.
9/10 "spectacular" on CNet.
8/10 on Pocket Lint.
5* reviews on Dabs
28 x 5* reviews on Amazon
£49.99 list, and still that price at John Lewis and elsewhere.
Cheapest elsewhere about £31.50 + delivery (Dabs), so about a fiver clear of the field, and if you're in the running for a nice wireless mouse, this could be the business.
The perfect accompaniment to all these recent laptop deals that are being voted cold - I'm assuming at least one person has bought each?