I haven't got a tray bake tray so did it in a glass oblong dish instead which worked out fine. One slice wasn't enough as a taster and we munched our way through a couple each. Still lots left for the weekend though, phew.
I forgot to give it a Kalhua wash before baking but still turned out quite shiny. Also I don't normally have much caffeine (except for in choc) so probably best not to give it too much Kalhua for me. I did experiment with a bit of a mixture of sugar as we had some odds and ends of packets left, so the sugar was mainly soft light brown, with a bit of muscavado and white granulated and I made sure it was all mixed in as evenly as possible.
So I was quite pleased as don't do much baking usually :)