Re: Ah, the carefree days of yore
IME that's the key with many modern vaccuuming devices - despite all their claims of "never clogging" they do actually gunk up very quickly.
It's handy to know if you want a cheap Dyson, they're quite clear about it in the instructions, empty the thing before the fill line or it'll just back up into the filter.
find a cordless one one ebay that 'works for a few seconds' and you can almost guarantee a filter clean will restore it to health.
Or if not, that thin bloke from off of old people adverts on the telly has re-invented the bagged hoover for some reason.