ninathenana The GP should realise that prescribing near the end of your supply is not good enough allowing for shortfalls over bank holiday weekends etc and the vagaries of staffing rotas in pharmacy.
I could suggest that you ring him and explain that you really need to have an extra supply in, which in the long term is better for your peace of mind saving you worry. It is also better for the NHS you could say as then they won't have to deal with hyperglycaemic complications. It is a matter of keeping people with diabetes Type 1 alive after all.
If there is a younger practitioner in the surgery you might find them more sympathetic. Or write a polite but firm email to doctor, pharmacy clerk and surgery manager so that between them they could give you at least a double supply to tide you over at times like this. Also say you will send a copy to whoever is in charge of GPs in your area and your MP. That should do it. If they go on about guidelines remind them you are a person and rules can be bent.
Well anyway I hope you get it all sorted.