Availability of Aira in the UK

Hi everyone,
Does anybody know whether Aira, the app which allows visually impaired people to receive assistance from trained sighted agents, is available in the UK? I know that people can sign up as a guest and use Aira in any Aira Access locations but is there any other way that people in the UK can use Aira? For example, can people in the UK subscribe to Explorer plans? Are there any plans for the Horizon kit to be made available in the UK? I would like to take advantage of Aira's services as I feel that I would benefit from them, however I only want to do so if it is worth it as someone from the UK.
Look forward to reading your responses,
Alice