15% is reflective of the real terms pay cut they have had for the last 12 years. It's not ridiculous, it is remedial.
A substantial pay increase and the return of bursaries actually would deal with the issues of terrible conditions brought about by inadequate staffing. It would make nursing a desirable and achievable profession again.
So funny you think nurses, if handed a decent wage, would all go part time. The reason they are literally about to STRIKE for a decent wage (something they could do at any time, any time they felt like holding us all hostage because we DESPERATELY need them, but haven't because they are by and large fucking dedicated professionals) is because they cannot afford to live on what they're making at the moment, never mind in the economic car crash that we are now entering. Nurses are already having to use food banks to make ends meet. Imagine the childcare bills of a family with two full time nurse parents, working shifts. Consider the cost of maintaining their registration.
More pay also means less to go around for new hires - only in the batshit Tory world that starves the NHS of funds. If you want people to have healthcare free at point of use, you pay the bloody professionals delivering it enough to want to keep doing so and you give the Trust's enough money to pay enough of them to keep the system working. If you don't do this, the whole thing breaks down. Which is exactly what the Tories want.