308 GTSi Door key blank

I am hoping someone might be able to point me in the right direction. I have had a scan through the 'search' but cant find the answer, apologies in advance if I have missed it.

I have a 308 GTSi '81, and it only had one door key. I have been trying to get a spare, but having visited 5 lock smiths here in the UK, they have told me they cant get that blank anymore... I am sure that this cant be the case.

Can someone point me in the right direction of where to go in the UK for a blank? Its a Borkey 1042 (see picture)

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Thank you in advance.

Cheers,

Tom