Thanks Bern,
I gave it a go this morning, but substituted with gluten free flour, so it maybe it didn't raise as much, but not bad. I also put a couple of cap-fulls of Cointreau and used milk chocolate.
Used a fan oven at 175 for one hour.
It tasted good, the next slice will be even better when we can wait for the chocolate to fully set
Regards
Alan