One solution is to get 3G (or 4G if available in your area). You just need a wingle plugged into a mains usb adaptor. Cost of unlocked wingle is 25 quid from a well-known supermarket dot com. Data cost depends which sim you buy. My payg is 3 gigs of data for twenty quid. Inexpensive for most browsing but pricy if you watch a lot of tube. Alternatively you can go the contract route. Usually quite fast but slow around 6pm and at weekends when folks burn bandwidth with inefficient voice calls.