What size cake tin do I need?

[katienana]

I want to bake this pirate cake for my DS. The recipe specifies a 30x20cm tin which is swiss roll tin sized. But will that be deep enough?
Piratecake
There is a comment on the recipe stating the same, the only reply says to try Lakeland but they don't have anything that size.

Katie, a 30cm x 20cm tin is only a Swiss Roll tin if it is shallow (around 1 inch (2.5cm). It is is 2" (5cm) it would be a Traybake, and if it was 3" deep or more, it would be a cake pan. Judging by the size of the recipe you are going to need something slightly deeper than a Swiss Roll tin, probably a Traybake.

Hmmm, I think the tin that I have always thought of as a swiss roll tin is actually a tray bake then - I can do brownies in it at any rate. No wonder my swiss rolls never work!!! Thank you very much for your help :-)