letting.co.uk gets forwarded to accomodation.com which is a pretty tacky website.
Personally I would set up a basic website, have some google ads on the pages.
Try and find property letting guides, cut and paste and put on the pages.
Typos do earn money.
Chances are your earn your £5 back within the two years of the contract for it, its not much but if you do as I say and put letting legislations up etc etc then you might have someone find your website that is a letting agent, who might not know 100% about domains, see some potential in it and offer to buy it.
Content usually means traffic.