You may be able to access mammograms in your 40s rather than start at the National age of 50.
Perhaps I am ill informed but there is a family history of breast cancer (mum and 2 sisters) so I mentioned this by chance to the GP when I went for something else. She gave me a screening questionnaire and now I can get yearly mammograms on the NHS.
It's not then first time I've mentioned it to a medical professional but the first the GP actually did something about it.
So if this affects you, please mention it to your GP.