Thanks for the advice everyone.
I only have 7 fish to transport (one of my Blue Gourami died last week! He must have been scared about the move...).
Anyway, I'm going to put the fish and some of the water into a bucket with the heater/filter in whilst I put the rest of the water into bottles I have been collecting so that I have as much original water as possible when I get back to the other end. I'll then pack down the tank etc.
Once the tank is in the card and ready to go, I'm going to put 3 fish in one large bag, and 4 in the other. The bags are going to be 1/3 fill of the tank water. I'm putting relatively warm water in a cool box, then putting the bags in that warm water so hopefully the cool box and warm water will keep the fish warm.
At the other end, I am torn between one of two options.
1) Putting the fish into a large bucket, with the heater and filter in for the night/next day. Then, that evening I will set the tank up.
2) Set the tank up in a temporary room, the move it all again later that day.
The reason for this, is because of the distance I am going the night before. I am to pick up the first at 8am the next morning.
Would the fish survive being in a large bucket (or something similar, like the cool box but out of their bags) for a 24 hour period?
Many thanks!