I have found a way for irregular users of the internet to gain access for £3.33 a month with no catch whatsoever. It best suits people who browse the web for news, weather, for research, online banking etc. It will not be any good for watching video, downloading or playing games.
Firstly, buy a pay as you go SIM card from T-Mobile with £20 credit on it. Then, buy six months unlimited internet access by texting 6MONTHWEB to 443. You will also need an HSDPA USB modem to allow your computer to make use of the SIM card. You may be lucky enough to wangle one for free from Freecycle or you can buy one for about £20 from Currys.
That’s it. Just top up £20 every 6 months and you’re online for £3.33 a month (excluding the one off cost of the HSDPA USB modem of course).