MyPet is the only Microchip Database I know of that doesn't feel like a ripoff. While alot of databases charge £10 (some even double that!!) to change your details each time, MyPet charges only a one time fee of £2 and then you can change your details whenever you want as many times as you want. It's very easy to use, and you can add a pet to the database in less than a minute. It also has useful features such as reminding you to make sure your details are up to date every 6 months and a microchip certificate, I was previously with a far more expensive database that did not even offer these things! I currently have 2 pets registered with them and any future pets will also be registered with them. I will never use any other microchip database again, genuinely great service.