
Paul,
pup-tents are any small free standing tents. If you have a look at the likes of Decathlon for 2 or 3 man tents you will get the idea.
https://www.decathlon.co.uk/2-seconds-2p-blue-id_8492461.html These modern pop up tents are great, use youv'e learnt the knack of folding them up.
Our boys went into them at the ages of 9 and 11 and loved the private space. We would get them to set up the tents in the corners of the pitch whilst we dealt with the caravan. They could get up when they wanted and kept there mess in there space. An extension lead plugged into a circuit breaker if needed for safety meant they had all they needed and gave us the peace we craved.
We went this "continental" route after seeing the Dutch turn up on French sites with small caravans and a sunshade. This was the total opposite of the UK white wobbly often twin axle monster with massive awning and annexes.
Colin