Summary: to get the UK government to consider better social rights laws, especially for rabbits and guinea pigs. 

This new law should acknowledge that both rabbits and guinea pigs are social, herd animals and therefore should not be kept alone. Pet shops, breeders and adoption centres etc should, where possible, home these animals in pairs - ideally litter mates or bonded pairs. (It is important to note that once old enough, they should all be neutered. Not only to prevent unwanted litters but also serious health issues such as cancer). Advice should be available on how to best find a companion for those who only have one rabbit or guinea pig. 

This may seem like a small issue but rabbits are a popular choice for many families with an estimated 1.5 million rabbits kept as pets in the UK [PDSA Animal Wellbeing Report 2016].Every year the PFMA commissions the well respected Pet Population report, which looks in detail at pet ownership trends. In 2018 it estimated that around 1% of all households in the UK have a guinea pig, which is around 0.4 million pet guinea pigs. 

Denying your pet the chance to make friends with members of its own species could be considered an act of cruelty—as is already the case in Switzerland. 

Rabbits and Guinea Pigs are naturally sociable preferring company (of the same species). Both pets can develop abnormal behaviours and may suffer if left alone and with nothing to do for long periods.

Rabbits and guinea pigs who live in big groups, or in pairs, are generally a lot happier than those who are kept alone. For lone rabbits and guinea pigs, it’s not uncommon for them to become bored, lonely and sometimes even depressed.

Rabbits and guinea pigs enjoy having companions around them to be able to groom, eat and play together. They are also well attuned to each other and are able to pick up each other’s moods and keep one another happy.

Rabbits are one of the most neglected pets in the UK and in 2018 research from the annual PDSA Animal Wellbeing Report showed 35% were inadequately housed and 56% live alone despite being highly social creatures.

Even those rabbits or guinea pigs that don't like a companion in their territory are much happier if they can see and hear others of their species. Keeping them in separate pens side by side would, although not ideal, provide acceptable companionship. 

For more on Switzerland’s guinea pig law see: http://mentalfloss.com/article/502372/it’s-illegal-own-single-guinea-pig-switzerland and https://www.google.co.uk/amp/s/www.wideopenpets.com/swiss-pet-protection-laws-lead-rent-guinea-pig-business/amp/