The transport decarbonisation plan will set out transport contributions to net zero, and we continue to work with our international partners ahead of COP26.

I am grateful to the hon. Gentleman for giving me an opportunity to talk about our active travel plans. With £2 billion-worth of spending, the Barnett consequentials from that will no doubt give him something to boast about in the future—but invented in Downing Street and, I hope, delivered in Scotland.

That is absolutely right. The shipping industry is one of the harder to decarbonise areas of the economy. However, technologies such as hydrogen have a big part to play, so this Government are putting a lot of research and development investment behind hydrogen in particular with a view to shipping. We have just announced the Teesside hydrogen hub, the country's first, to help develop more of those technologies, and the hon. Gentleman will not be disappointed by our ambition through our transport decarbonisation plan.

Once again, I am very pleased that the Barnett consequentials ensure that money is available to spend in Scotland. We should welcome the fact that £3 billion is going to buses. The hon. Gentleman mentions the £120 million we have announced for zero-emission buses in 2021-22, which will give many hundreds of buses a start on the production line. We are on target to deliver all 4,000 that we have promised to start building in this Parliament.

Funnily enough, I do not agree. It is worth the hon. Gentleman's Scottish voters understanding that that money is available through the Barnett consequentials. If bus services were as good as is claimed, then it would not be the case that in Dundee bus users were being warned just last November to expect big changes to services, the worst since the 1950s, which would have negative impacts for older people and those dependent on bus services. I do not think it is quite as rosy as he likes to make it sound. This Government in Westminster are committed to decarbonising the whole of the United Kingdom.