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If its in a wet zone (0 and 1 I think?) it needs to be earthed as well, esp if the bezel/ casing is metal. Loads of houses have those metal branch down lighter jobs in kitchen and aren't earthed when IIRC they should be.
BrickMan-
Do you mean specifically integrated? or all zone 0/1 lighting. I've been caught out not being up to date on the now not so special locations before.
Also I guess this is a consideration because you are anticipating there being no earth available? I forgot about that as most of the lighting loops I come across have an earth.
Just had another look at the chart. Zone 0 is in the bath/shower tray so earthing makes sense. Zone 1 inside the shower compartment or right above the bath/sink, again sensible for that to be earthed especially if metal.
Airhead
If it's a very small bathroom then you might need them to all be IP65. It's not required for all fittings in most 'normal' size bathrooms. You need to check on a case by case basis of course.
I fit integrated downlights if I'm changing them all in a room, especially bathrooms. Not had to replace an integrated unit yet but I've only been fitting them for roughly 5 years. A lot of fitters are buying a spare unit in case of early failure in one unit. They should be a good economical long lasting choice but who knows what replacement price will be compared to bulbs over time, especially considering inflation.