There is a weight limit for individual cases for health and safety reasons (to protect baggage handlers), I think it's 32kg.

Pippy

If I understand the question - then the answer is you have total luggage allowance of 20kg x number of people in your party, and you can take one bag/case each. So you could take 2 bags at 20kg each or a 25kg and a 15kg or ... etc. But as Pippy says the maximum for any one bag is (I think she's right) 32kg. I've known people be forced to buy a new case at the airport and split the load when they'd piled everything for a family of 4 into one big (very big) case.

Thanks guy's you've put my mind to rest

Nia x

Nia, hi!
If I were you I would check with First Choice, especially with the very recent changes in their business structure, as to the maximum weight for each suitcase. In my experience, I have seen weights as low as 20kg and as high as 35kg allowed by various airlines. This is worth checking, as, over the years, I have seen so many people totally devastated at airport check-in desks because they have to rearrange their luggage, or even worse, leave some behind!