It's really good. Thanks @Spanglor !
Next time I'll use a shallower tub. I went for the one that matched the size of the baking tin, but I think it was too long a drop for such pillowy dough.
But the garlic, rosemary and salt sprinkled on top makes it very addictive.
@marramgrass Thank-you! It’s one of the wettest doughs I’ve worked with, but the plastic tub method made it easy. Here’s the link in case you fancy giving it a go yourself https://www.nancybirtwhistle.co.uk/recipes/focaccia/