I think the fact that hospitals basically don't do doctors at a weekend is a true scandal.
But I don't see anyone persuading consultants to start doing routine operations on night shifts on a regular basis. You may sneer and diss them for that, but I express no opinion at all, save to say that it just ain't gonna happen any time soon.
A consultant does what he is obliged to do under his NHS contract, and then he goes off to earn some serious money in his private work, you know, private ops, consultations, medical reports etc. If you are going to oblige him to work nights say one week in three then he plainly cannot work in his private business that week and again, for just that reason, it can't be done.
Also if you are going to operate theatres for an extra 100 hours per week, where the feck is the money to do that coming from?