Drill Precision

[D.Howard@kid0110.wins.icl.co.uk]

         The manual calls for some less than typical drill bit sizes, e.g. 
         3.3mm. Is it somebody's maths is slightly suspect and they are 
         trying to quote a metric equivalent for 1/8" or do I really need 
         3.3mm ?
         
         Clearly such bits are not available down the local DIY store. 
         Anybody suggest a suitable supply in the UK ?
         
         Thanks,
         
         Dave Howard
         #309