I ended up getting 2x Servage accounts both now 5000GB transfer per month, so a total of 10,000GB, and I basically divided the content across the two hosting accounts. so I pay like £10 a month for 10TB transfer - thats pretty damn good!
http://www.servage.net/?coupon=cust22647 - If anyone else is interested, use this coupon code/link for bonus storage space.