There are regular collisions at this junction because motorists speed on Bournville Lane and the site-lines are very, very poor. The simple solution is to change the priority. This would solve the problem for motorists, and make it easier for cyclists to use Hay Green Lane as part of a cycle route.
I have suggested the change of priority to BCC but was given a list of excuses why this cannot possibly be done. One of these was that Bournville Lane is a blue route. I see no benefit in an emergency journey ending here because someone pulling out of Hay Green Lane couldn't see the approaching police car.