Can anyone help me with a router and cutter problem

[Matt69]

Basically I've got a bog standard router like below:
http://www.screwfix.com/p/direct-pow...ter-230v/25568

What I want to do is insert a cutter into the router but the shaft is only 3mm and the collet on the router is alot bigger.

Can anyone tell me if I can get a sleeve to adapt it and if so where from. The like of screwfix and B&Q dont seem to do them.

Thanks