Smart Meter

Bulb is inviting me to switch to a Smart Meter.
What assurances can be given about the following:
(1) who pays for the Smart Meter? Will my bills be increased to recover the cost?
(2) How accurate are readings from the Smart Meter? (There are many horror stories in the press about inaccuracies).
(3) If, as Bulb suggests, their engineer is permitted to connect the Smart Meter to my Wifi, how do I know the Smart Meter is secure?

(1) who pays for the Smart Meter? Will my bills be increased to recover the cost?
We all pay for smart meters even if you dont have one regardless of which utility company you use, it is built in to the billing costs. They are installed `free`
A smart meter can automatically send daily meter readings to your supplier, meaning they can bill you accurately for the energy you've used. You won't have to pay upfront to have a smart meter installed - smart meters will be paid for through everyone's energy bills.