Sounds like you monitor your diabetes carefully and look at the insulin dose to see if it is enough. You could show your record book to the GP, suggest that you would like to increase the dose and ask for more pens. Yes - supply of test strips is a worry, particularly for car drivers. But giving you an adequate supply of strips and insulin so that you can keep well will save the NHS money in the long term, as well as improving your quality of life; catch is the folk who purchase health care and dept of health do not really look at the long term savings of keeping you well, and state pensions run on the premise of short survival once retired. Best wishes.