Oh for Maplins still being around. Are RS still trading?

The relay will likely either have the operating coil or the contacts rated at 24VDC and 250VAC respectively or vice versa. I would guess that with 16A being mentioned that will be the current carrying capacity of the contacts so 250v for those, 24v for the coil.
Rs comp, farnell, cpc and rapid are all still going.
 

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