Probably not as a web dev; senior / lead Java developer, Oracle DBA, managerial level at big companies like banks and insurance might get you closer to that. But to be blunt, you're probably not worth 200K as a web developer.
I found it really hard to find jobs that pay anywhere close to US salaries in EU.
Unless things are very different now, I would plan to move to US to make 'that kind of money'.
I was going to say. Unless you have things lined up, I would hesitate to move to UK without a plan. I am saying this as my sister is attempting this very thing ( and me trying to discourage her since its a business pie in the sky kind of dream ). The days easily obtainable jobs ( especially the low level ones ) for other EU members are over. She did not seem to get that memo. On the high end of the spectrum, banking lost some jobs as a result of Brexit. Dunno about insurance.
US has its benefits, but I would consider age as a factor ( if you are younger, you may be able to worry less about insurance and whatnot ).