Sound like a native.
Real UK accents from real people. Hear how a Londoner, a Scouser or a Geordie actually says it, copy it, and get told what to fix.
LondonRPScouseGeordieManchesterYorkshireBrummieScottishWelsh
Hear itScan any page or pick a lesson and hear it in the accent you want.
Say itRead it back out loud and see which words gave you away.
Ask a nativeGet any word or sentence said to you by a real person from that part of the UK.