Unlimited data is not really an option nowadays for this kind of use. 3 offer it but it's strictly for use on the handset itself and they do monitor for usage outside of this, even limiting tethering to a specific GB.
This is not the solution you are looking for. Also with mobile networks the speeds will vary significantly based on localized usage. Overall you probably will not get a good experience.
I can see ADSL estimates up to 6.5Mbps at this postcode - I would work on getting the most out of a fixed line service. Have you taken all of the basic steps to ensure everything is setup optimally in your home? We can help out.
The speeds available should be fine for casual netflix, youtube watching, online gaming, skype calls etc. Obviously not 5 netflix streams at once