However, despite initially being given approval to go ahead with the non-BBC project, bosses told Davis the podcast risked exposing him to accusations of political bias.

“As the series has gone on – in fact as the world has progressed over the last few months – they have become concerned that anything like this trying to inform people about heat pumps can be interpreted, rightly or wrongly, as somehow treading on areas of public controversy,” he told followers of the podcast’s YouTube channel.

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