I think it will be changed eventually, on a replacement basis. So as/when work is done, an alternative is used.
Regardless of whether it’s changed, it’s not really comparable to lead shot.
Flashings tend to be a one off; once fitted they stay in place for hundreds of years. Whereas lead shot is continually being added.
Flashings are not generally affecting wildlife. Birds don’t peck at lead flashings, whereas they do ingest lead pellets. This affects them and is also passed up the food chain.
Lead pellets can directly affect meat for human consumption, whereas any lead from the surface flashing during rain is massively diluted and may never affect the food chain.
