Quadrantal rules are about to be replaced by the semicircular rule in the uk, and aren't obligatory for vfr.
A lot of UK airspace is so busy that it's not practical to comply with them whilst remaining out of controlled airspace and cloud, retaining the ability to glide clear of built-up areas, and whilst making the frequent heading changes required to pick your way through the airspace. On another forum the consensus appeared to be that few people even attempt to follow them here.