Emailed my local dealer last night (Meridien Milano Bournemouth) and had this reply come today....
''Thank you for your enquiry, the following stickers are the only ones available from Alfa,
12855380 0.43+vat fan warning sticker
12855480 0.34+vat belt warning sticker
12855880 0.43+vat hot liquid warning sticker
12856080 0.74+vat a/c pipe pressure warning sticker
We can order these in if required. This normally takes 2 working days.''
I'll pop in and see them and get them ordered (will probably do the same as Andy665 and get two sets),a big thumbs-up for Meridien for replying when I didn't hold out much hope of getting one for such a low value parts enquiry.
Thanks for the info on the paint finish,it sounds as though some satin black would do the job,it has to be better than the flaking black hammerite I have on there at the moment!.
A big thanks to all the above replies too.