You're missing the point. If you reduce the 40% tax relief then you are significantly increasing the costs which are unavoidable for all NHS staff. The NHS pension has been made worse multiple times in recent years so to keep it as it is for DB schemes would either require reduced contributions or a different tax arrangement specifically for them or you will almost certainly see further strikes.
You're arguing about a point I wasn't arguing about, but anyway...
The point I'm saying in your NHS case is up their pay, so they would have been no worse off (or even much better), pay wise, compared to how they've been raped by the Tories for 14 years. I.e if they were paid properly (for their worth, in line with the private sector or other options) then there would have been no initial strikes in the first place etc. i.e the starting point would be to undo what caused those initial strikes.
Sure, some of them might strike if the 40% payers got less relief, but they would be in the same boat as the rest of everyone else, it's still no more tax, it's just less relief from tax, there's a difference. How many of the nurses are paying 40% anyway, or will ever get that? Even if they got the pay bump they probably wouldn't be on that. The points I'm suggesting would be bringing in more money so people like nurses would be better off.
Same for doctors, pay them what they're worth, especially junior doctors (these get shafted the most), but again, when their worth goes into the higher tax bands it needs to be taxed too, like everyone else. Everyone in the higher bands needs to be taking a hit, and those furthest into the higher bands the most hit, which is what would happen, but they won't even barely notice. The nurse on 32k-50k would notice though, the idea is they should end up much better off from it overall, and they would.
Yes, the pension has been made worse, they only do this to save money, and I've been there when they've done that in the public sector, it was the same in the forces. But public sector pensions are still great and would be still great, much better than the average person in the private sector (for the same wage).