I guess this might have been worth acquiring if you're also the owner of NottinghamOnline.com/.co.uk and want to protect the brand, but otherwise I can't see any value in it. Also, to me, the word 'online' seems a bit dated, going back to the days where someone might ask 'Are you online?' before it was taken as read that you'd have a website, etc.
On a similar note, I was driving behind a van the other day that was advertising a companyname.construction domain, but as it doesn't look like a domain name (even to me, as one of the relatively few people who's aware of the new gTLDs), they'd included 'www.' at the front, resulting in an unwieldy-looking 'www.companyname.construction'. I couldn't help thinking that companynameconstruction.co.uk/.uk or .com would've been a better bet...