That's probably about it. As eric has said, in 2001 the bathroom should have had supplementary bonding installed, whether or not there was an RCD - so, even though the current regulations are not 'retrospective', if that bonding is still there, it would actually be compliant with current regs without RCD protection.
True. I often forget that, since it seems surprising to me that it applies to all circuits 'in the location/room' (rather than just 'in zones'). In particular, I find it hard to remember (since it doesn't seem very electrically logical to me) that there is a requirement for RCD protection of light fittings, fans and pull switches, all of which exist only on an above-zones ceiling (as I've said, a shaver socket/light or mirror lighting etc. may change things). Whatever, apologies for having 'misled'. However ....
That we do agree about, particularly when the lighting circuit does not exist 'below ceiling level'.
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