Smart meter

Do i have to have a smart meter installed? Or can I refuse as I would prefer not to have one installed?

From the Ofgem site:

While we and the government think that all consumers will benefit from smart meters, they aren’t compulsory and you can choose not to have one. Choosing not to have a smart meter may mean you don’t have access to all the available tariffs on the market, some of which could be cheaper. If you don’t want to have a smart meter now, you will still be able to have one installed for free at a later date.
https://www.ofgem.gov.uk/consumers/household-gas-and-electricity-guide/consumer-guide-understanding-energy-meters-ofgem/smart-meters-guide-your-rights