I helped a relative of mine decorate a frozen cake (it was part of her wedding cake and it had been frozen for over a year!). She took it out about 24hrs before we decorated it and it thawed out perfectly. The cake was not a sponge cake however, it was a sort of an almond tart that is very popular in Malta and it is a type of cake that is used for special occasions such as weddings, Easter (very popular in Easter), Christenings etc. Thawing time may vary according to the climate of course. The weather in Malta is very hot in summer and mild in winter so 24hrs in advance might not be enough in England since you live in a colder climate. Hope this helps!
Marlene - CakeHeaven
