It isn't a postcode lottery. The doctors are obliged to follow the NICE recommendations, which are as follows:
Self-monitoring of blood glucose
1.6.12Take the Driver and Vehicle Licensing Agency (DVLA)
At a glance guide to the current medical standards of fitness to drive into account when offering self‑monitoring of blood glucose levels for adults with type 2 diabetes.
[new 2015]
1.6.13Do not routinely offer self-monitoring of blood glucose levels for adults with type 2 diabetes unless:
- the person is on insulin or
- there is evidence of hypoglycaemic episodes or
- the person is on oral medication that may increase their risk of hypoglycaemia while driving or operating machinery or
- the person is pregnant, or is planning to become pregnant. For more information, see the NICE guideline on diabetes in pregnancy. [new 2015]
1.6.14Consider short-term self-monitoring of blood glucose levels in adults with type 2 diabetes (and review treatment as necessary):
- when starting treatment with oral or intravenous corticosteroids or
- to confirm suspected hypoglycaemia. [new 2015]
1.6.15Be aware that adults with type 2 diabetes who have acute intercurrent illness are at risk of worsening hyperglycaemia. Review treatment as necessary.
[new 2015]
1.6.16If adults with type 2 diabetes are self‑monitoring their blood glucose levels, carry out a structured assessment at least annually. The assessment should include:
- the person's self-monitoring skills
- the quality and frequency of testing
- checking that the person knows how to interpret the blood glucose results and what action to take
- the impact on the person's quality of life
- the continued benefit to the person
- the equipment used. [2015]
https://www.nice.org.uk/guidance/ng28/chapter/1-Recommendations#blood-glucose-management-2