former Oxford East (Labour) MP Andrew Smith was an excellent constituency MP , so much so that even some (usually) Tory voters gave him their support at the ballot box in (some) GE's ..... if memory serves, last time he stood ( and was re-elected) as MP his campaign slogan was the simple, yet true statement (along the lines of) Everybody knows somebody who has been helped by Andrew Smith
On the subject of PR , one application of a form of PR, suggested some years ago now, would be to tweak/ slightly increase constituency sizes in each county, so each constituency retained its 'own' MP , with the retweak providing a PR element that would result in 'electing' a County MP (or two)
I think, although discussed at length it was overwhelmingly rejected as a viable or workable option, - probably by a majority of mainly Tory MPs sat in 'safe' 'shire seats wanting to retain the status quo?