Chris -

Stock should be 2 "blippers", 2 "master" keys (black and thinner), and
1 valet (ignition and doors only, grey and thicker) key.

"Blippers" (quaint...) No, these not are a dealer-only matter. Over
here in the new world, we get them off of eBay per the FCC ID number.
The radio part works OK - the cases are really cheap and fall apart
after a couple of years. Each one has a unique serial number and the
receiver only stores a limited number of IDs (5?). Just like with the
smart keys, you have to program all of them at the same time, because
the ID table in the receiver(s) 1s/are wiped when you first start
programming. Specific instructions for programming the remotes and
keys can be found through Google.

Good luck -

Greg

PS - where in the UK are you located? I used to hang out around
Newbury and Milton Keynes years ago. Loved the place.... and the beer.

I don't remember if this model had the 'red' key which was essential to
allow the reprograming of additional keys or not.  Suggest you look in
the owners manual.  I also know that at some point, but I think it was
after 1999 but can not remember, you may be able to unlock the car with
a key, but if you do not use a blipper the alarm will sound when you try
to drive away.  So if two of you are using the car, 2 blippers is a
must.  Again check the manual