Agreed.
I find it extraordinary that so many don't get that financial compatibility is crucial to marital harmony.
He sold himself as one person and quickly decided that in fact a 4th, a 4th!!! Masters was preferable to moving forward in his career.
Clearly the OP is on one original path and 4th Masters boy is now on a different one completely.
On this basis she should take ANY statement from him going forward with a complete pinch of salt.
He has shown her who he is, unreliable, and she should walk whilst she can.
A 4th Masters is a wonderful hobby for someone with the money to fund it, not for someone at the beginning of a marriage wanting to purchase a home and start a family.
The OP has quietly been out manoeuvred by him and has been placed in the adult, high earning position where their London lifestyle will be dependent on her career trajectory.
OP, if you were my daughter I would be warning you to think long and hard about what you want and how you feel about a future that is going to be largely on your shoulders.
He has changed the posts, as he can anytime, but you do not have to accept it as a given.
He has very sneakily pulled a fast one on the OP, and I for one don't believe for a second this is accidental.
He's lazy, but not stupid.
The OP has been sold a pup, long enough to get married and now he has a new vastly different plan.
Up to the OP if she wants to remain married and trusting of someone who would do this.
Expect short mat leaves OP as women with big careers often return very quickly as the jobs need them and the London lifestyle demands it, particularly when they shoulder it alone.
Oh and those that study endlessly find it a great reason to avoid sharing the house hold duties load etc.
Apologies if the above is harsh, but reality often is!