Dissolve the two jelly packets separately in 250ml of boiled water until completely gone. Then make up to 1 pint of cold water.
Chop the 2 swiss rolls in to little pieces and mash up enough to cover bottom of dish you will be serving in.
Pour the raspberry or strawberry flavour jelly on top of the swiss roll and put in fridge for 24 hours.
Put other jelly in bowl and leave to set for 24 hours.
After it has set take the bowls out of the fridge and mash up the jelly without the swiss roll.
Get the packet of custard and spread evenly on top of jelly with swiss roll. Add mashed jelly on top of that. Whip whipping cream until thick and spread on top of the trifle. If you want you can add sprinkles on top of that. You can enjoy straight away.