Darren,
Fitting ER32 collets will be a major step up for you, but go the extra yard and get the full 18 piece set of collets. It is a PITA when you come to use a cutter or drill and you haven't got a collet to fit it.
Remember, customs are clamping down now, and will charge import duty on anything over £18, then the P.O. charges you £8 for sending you the postcard to tell you to go collect it from the sorting office and pay the due taxes. I tried a couple of months ago to get some bits in for my mo'sickle from the States thru the back door, by directing it thru Frankfurt in Germany, but I still got stung.
John