International Cat Care (previously Feline Advisory Bureau) for many useful factsheets about cat behaviour, and health.
Dogs Trust This charity not only rehomes dogs, but also provides free and low cost neutering, and useful information for dog owners.
VIP Pets This recommended pet sitting agency employs Veterinary Nurses and very experienced pet owners, not only looking after your pets whilst you are away, but also has a range of other services.
VidiVet VidiVet is a smartphone/tablet app that gives you free of charge access to an experienced vet, no matter what time of day or night.