I see it with DB upgrades, people replace the old flush fuse box with a new surface DB, extend the wires and say the old regs apply.

Another favorite, people removing an old round 5 socket outlet, fitting a PVC extension box with a new PVC 15 amp socket outlets and only connect the 2 wires to the new socket outlet (no earth), they say the old regulations apply. Actually you have now, not only created a non compliant installtiion, but a dangerous installation.