Brexit (and moreso post-GFC austerity) have been actions of brain-dead economic self-harm, but I don't know where you got your numbers from here. Even PPP adjusted the UK is ahead.
It was from this, a clip from BBC Question Time I confess I did not fact-check it myself, I allowed myself to believe that a peer and former tory minister would quote correct figures.
Numbeo.com for numbers, personal experience as well. Lithuania might be doing ok, but it's nowhere near how good the UK is doing. Thus anyone struggling in the UK would be dead in Lithuania.