Firstly make your jelly as per the packet instructions in a jug (for me this was separating into cubes and then pouring boiling water followed by cold water onto it)
Get your trifle dish and cut your sponges into pieces (halves or thirds is fine). Place them all over the bottom of your dish in a nice layer. Then place any fruit in between the gaps of the sponges and some on top if you wish.
Pour your jelly liquid on top of the sponge and fruit to cover it and leave in the fridge to completely set. Setting jelly usually takes about 2-3 hours, but just check it every now and then and you'll know!
Once the jelly has set, slice your strawberries in half and place them on top of the jelly all around the sides of your dish as per the picture. Try and get them all as even as you can for the best effect.
Pour your custard onto the jelly, going up the dish as high as you want it to go, I like a lot of custard! Just remember you still need to add the cream so leave some space. You can make your own custard but shop bought is always very yummy and easy too.
Whip up your double cream in a large mixing bowl till it forms stiff peaks, make sure not to over whip. (You can add a couple of tbsp of icing sugar to your cream for a little sweetness, but there is plenty of that throughout the trifle anyway!)
Spoon the whipped cream on top of the custard.
Finish with some slices of fresh strawberries when you are ready to serve. Enjoy!