Lol 30 pence i bet.
If its a host on this forum my bet is they are a reseller for scott. And they are just overselling like mad.... 50Gb Unsold space you would be looking at around £20-50 a month on a quality US server, where as a UK server with those specs would probaly be 3 times more than that a month, For a low usage site it dosent matter where the server is locataed geographically, alot of hosts have there server in there bedrooom!
And like camers said 50Gb thats alot, i only use like 55Gb on my PC!
Good luck with the host