You probably wouldnt have had a filling loop prior to the new boiler being fitted. The old system would have been fed from the small tank in the loft. As the new system is sealed the water is supplied via the filling loop. It seems strange to put it in the airing cupboard, probably because this was easier (and cheaper) for the installer. I would have said it should be under the boiler, so you can fill the system whilst watching the pressure gauge on the boiler, thus preventing you over pressurising the system.
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