What is the best way to heat a room with a vaulted ceiling?

The room houses the kitchen and diner/sunroom. It is 40sq/mtr and also has several velux windows in the roof. I say diner/sunroom as it is not glazed like a conservatory but has 5 windows (approx 900x600) across the span of the room and patio doors at one end.

What is a VPN?

VPN is (Virtual Private Network) were first used by companies to enable their employees to securely access internal systems such as email remotely (e.g. from home or while on business trips). Today they are increasingly being used for personal use by individuals to protect their privacy while online in public places (e.g. when using the wi-fi connection in a cafe) or in a country where the internet is censored / blocked (e.g. China, Saudi Arabia…).