Thanks all, so I've found out they are both owned by electrium and both the crabtree and wylex boards of this type are identical from the same factory and then rebadged. But of course they said they cant be used interchangeably as they havent been tested so would avoid warranty. What a world we live in. Common sense says changing a badge isnt going to make any difference but of course the manufacturers want you to spend the money. The guy said it would void any warranty. This has always made me laugh, as if any db that burns down they expect me to believe they would ever take responsibility and not pass it onto the installer. I have a feeling their budget for solicitors might be bigger than mine ?