DESNZ, the UK Government department for energy, is calling for consultation on pure hydrogen pipes across the country, planning for hundreds of km by 2035, where almost no pipes exist at present. The deadline is September as described in the link https://assets.publishing.service.gov.uk/media/68754478a8d0255f9fe28e36/hydrogen-economic-regulatory-framework-consultation.pdf
It is vital that this concept moves forward fast because Britain is falling behind countries like Netherlands that have already taken action. Avoiding confusion with the Natural Gas (methane) network is important because hydrogen purity is critical and must be 99.99% or more. It is obvious that local hydrogen hubs will be small at first, as Birmingham is with only 3MW of electrolyser capacity, but now charging ridiculous prices of £23/kg for filling hydrogen vehicles. As these UK hubs add up to 10GW of electrolytic hydrogen by 2030, connections will be necessary, especially to fill salt cavern storage that is being developed now.