Yes and no. The range for a senior web dev outside of London writing PHP and JS is pretty big - jobs start at about £40k for someone building Wordpress sites and a bit of JS, and go up to £90k for someone working on full stack JS apps in fintech or ecommerce. Inside of London (or remote working for a London company) it goes up to around £110k. Obviously outliers exist too at both ends of the scale. If you want more than that you're looking at 'architect' title, or maybe some sort of leadership or CTO role.

To be honest, the wages are quite low compared to other tech centres. As someone in the UK I'd definitely like them to be higher.