What do you pay that £30 for? Does it include telephone services? Does it include line rental? Does it include anything else, such as TV services?
There are plenty of people here in East Anglia (particularly in the more rural parts of Norfolk) who can't even get a 1Mbps download speed so, to them, over 50Mbps must be almost unimaginable!
As a guide, the Government's original basic target speed for downloads was a minimum of 2Mbps (using traditional copper cabling). I've still got a copper-cabled service but I get around 10Mbps and pay about £18 per month for it (with nothing else included). However that's a 'business' service that's incredibly reliable, with excellent support and a good contention ratio; if I went for a 'budget' package (but still using copper cables) I'd expect to pay only half that price but only get half the download speed as well.
With the advent of (so-called) super-fast broadband, the Government has now set a target of all homes having download speeds of at least 24Mbps within the next few years. (However the EU's target is slightly higher, at 30Mbps by 2020). So you're already getting well above the official target figure.
BTW: The most widely recognised speed-testing service (which is frequently used as a reference point by the technical press) is this one:
http://www.speedtest.net/