Got a reply;
This Rabbit and Guinea Pig that is on the website have shared their life together for 2 years and they depend on each other for comfort and reassurance, it would not be in their best interests to separate them.
If animals are brought up together and are properly looked after in their needs and environment there should not be any problems just like your dog and cat many households have dogs and cats living together very happily although they are by nature not really compatible.
We as an Animal Welfare Society would not put any animals into a situation that was detrimental to their health and wellbeing I hope this e-mail reassures you of this.