I know this has been done a few times, and got as much info from the search as I could...but just need to clarify with people here before doing anything!
Called up my local dealer (about 25 miles away!), who advised the usual: £200 for replacement key...but also went on further to advise of people getting keys with the black central locking button (like this one:
ALFA ROMEO 146 147 156 157 REMOTE ALARM KEY FOB GOOD on eBay, also Car Alarms Immobilisers, Security Electrical, Car Accessories, Cars, Parts Vehicles (end time 27-Mar-08 16:06:49 GMT))
getting key cutters to clone as mine, and then take it to dealer for £80 reprogramming!
So really, all "should" be well if I get the key from the above link from ebay, get key cutters to alter and copy my current key, and dealer to reprogram?