Long thread about it here on the LPG forum
It finally seems to be getting signs of going back to normal - The local Shell hadn't had any since early february and has just been refilled today for the first time.
I gather some of the issue is the amount of time they are waiting to offload at whatever port it comes in on.
Filllpg is better with the app than the website, the site is not working well and thats unlikely to be something that improves from what the other Richard has said (no time to sort it)
Could be worse - Diesel is even more expensive, filling the tank on my backup vehicle with Pay@pump needs two hits on the card as it only lets you have £99 at a go. £126 to fill a tank that had slightly less than 1/4 left