As part of your APGB aerial photography licence which is funded by Central Government, you get access to the latest aerial photography, and an archive of previous years' imagery. This goes back to 2007.
The national aerial photography capture programme works on a cycle capturing as much of the country in a year as possible. This means that in some years your area may not have been covered, so there's no data to show and you'll just see a white background.
The refresh cycle for aerial photography is typically every 2 years, but this can change based on weather conditions, airspace challenges and central government procurement requirements.
You'll find the aerial photography under a collection called "Aerial Photography (APGB).