Place the tea, marmalade and sultanas in a bowl and leave to stand for 1 hour.
Add the remaining ingredients and mix well. Grease and line a Pyrex Non-Stick 30cm Loaf Tin and spoon the mixture into the tin and bake at 150ºC/ 300ºF/ Gas 5 on the middle shelf for 45 - 50 minutes. Test for doneness with a metal skewer. Push it into the centre of the cake and if the skewer is clear, the cake will be cooked. If not return to the oven and re-check after 5 minutes.