i wouldn't call that standard wage, rather the lowest end of the spectrum where you could theoretically shop a "senior" outside of london.

Median senior dev salary is £70k according to recent job postings: https://www.itjobswatch.co.uk/jobs/uk/senior%20developer.do

	▲	eterm a minute ago \| parent [-]
		And that includes London, it lists "excluding London" as £65k. People overestimate how much senior devs in the UK earn, even after knowing they're not well paid, my usual response to hearing we should be earning £90k+ is, "well give us a job then"!