Line a 9x9" square tin with parchment paper, and leave to the side for now.
Melt the golden syrup and the butter gently in a pan on a LOW heat.
When the butter and syrup have melted fully and gently starts to bubble, turn off the heat and add in the chopped chocolates.
If the chocolate isn't fully melted, then turn the heat back on to a LOW setting, and heat briefly to encourage it to melt. Make sure the heat is low and you don't leave it on too long as this can cause it to split.
Pour the digestives, Crunchie, and raisins into a large bowl, and pour the syrup/chocolate/butter mix on top.
Mix all the ingredients together thoroughly, and then pour into the tin and press down.
In another bowl, melt the 200g of decoration chocolate. Once melted, add in the Crunchie spread and give it a mix.
Pour over the tiffin, and spread. Sprinkle over any extra pieces of Crunchie you want.
Leave to set in the fridge for 3-4 hours, or a bit longer if needed. Sometimes, I leave it overnight.
Once set, remove from the tin and cut into your portion sizes. I usually do 16 pieces, or 25 if I want smaller ones. Enjoy!
Notes
Its a lot better if the chocolate is chopped finely when going into the butter/syrup mix - the less mixing required, the less chance of it splitting.
You can use all milk chocolate with this, or all dark chocolate. I just prefer using half and half of each!
This recipe will last for up to two weeks in the fridge, but if its a cool day it can be room temperature as well.
You can add in marshmallows if you want, but as its a tiffin recipe, I've kept it without. Add in 100g, at the main mixing stage.
The topping part is completely optional - the Crunchie spread is found with the jams and such in UK supermarkets. If you can't access it, you can just leave it out, and add in 100g more chocolate to decorate with.
If you can't access Crunchie bars themselves, use any Honeycomb bar you like!