You can now get cat flaps which detect your cat's chip in order to release the locking mechanism. This ensures that only your own cats can use the flap without the use of uncomfortable and potentially dangerous collars. Cat flaps can sometimes be a bit of a mixed blessing for a timid cat because of the risk that they might allow rivals to invade what should be a secure haven.
There are currently two UK manufacturers, PetPorte and Sureflap. The SureFlap system is nicely appropriate for Cambridge Science Festival fortnight as the technology that powers it was developed by Cambridge Resonant Technologies Ltd of the St John's Innovation Centre
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