Apparently within the Energy Bill that went through Parliament the other day are measures that allow the authorities to force entry to fit smart meters. 
This from citizens advice:
Refusing a smart meter
You don’t have to accept a smart meter if you don’t want one. If your supplier tells you that you must have one installed, contact the Citizens Advice consumer helpline.
If you refuse a smart meter, you might find it hard to access all tariffs. This is because in future the cheaper tariffs offered by suppliers might only be available to customers with smart meters.
If you need to replace your old-style meter because it’s unsafe, you might not be able to refuse a smart meter. This is because not many old-style meters are made now - your supplier might not have any in stock.
You can ask your supplier to install your smart meter with the extra functionality switched off. This means it’ll work in the same way as your current meter, and won’t send any information to your supplier. Contact your supplier to check if they can do this.