Hi CSF
Thanks for the reply.
I have tried google but must admit that I asked for UK suppliers only. I'm not sure if I'm being too fussy. For instance I've seen 1.6mm brass tube (square) instead of 1.58mm (a minute difference) but I'm not sure if it would be OK. It's the same with the brass sheet I've seen 0.2mm but not 0.3mm. I suppose the sheeting wouldn't be too bad but really not sure about the tube. I've also found some jewellery wire that is near to size for the wire it's not brass but gold coloured so would do.
I can't make up my mind lol.