km) ride to Swansea, which should give you plenty of time to enjoy a celebratory meal by Swansea Bay and arrange any onward travel. It is a triple view of Wales, he is very much in the present when walking up hills and along the 2000-year-old road, parts of which are still visible. I immediately smile at this harbinger of summer, thinking of my mum who phones me each time she hears one. I was wearing a red Welsh rugby hat at the time, and it was instructive too how much anti-Welsh abuse was thrown at us as we lay there, silent – and surprising how, finally, the onslaught lapsed when we addressed the police in Welsh.

Whilst Bullough has moulded his words, the artist Jackie Morris has created beautiful illustrations which adorn the cover and separate chapters. It was built to carry away the natural resources of Cambria – the minerals particularly, especially the gold – and bear them back to the imperial city.

People may not want realism but it’s still our job to try and supply it in compelling and truthful ways. Fairbourne, on the south side of the Mawddach estuary not far from Saint Elen’s home, is the first village in Britain expected to be lost to climate change.

In a particularly powerful chapter towards the end of the book Bullough reproduces in full the speech he gave to the court in his own defence before his "conviction".But inevitably he explores the past of the landscapes and the people that inhabited the villages that he walks through. It’s a straight-forward start to the fourth stage, which crosses more of the Cambrian Mountains and through the Elan Valley to Rhayader. But this book was so much more than the history and passion for Wales, Tom has produced an honest clear insight into our climate crisis, showing the affect on Wales and the world.

Sarn Helen - Helen's Causeway - is the old Roman Road that runs from the south of Wales to the north. Sarn Helen" is the title of a song by Welsh band Super Furry Animals, appearing on their Welsh language album Mwng. From here we head toward southern Eryri and climb the northern slopes of Cadair Idris with stunning views of the Mawdach Estuary and Cardigan Bay.His one digression from the Welsh road - a transcript of his defense when he was jailed in London after an Extinction Rebellion protest - is in particular deeply moving.