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Hi, Thanks for the reply and advice. I'll give it a try and update the post.

We have a 2015 Fabia 1.2 TSI with keyless start stop. The vehicle came to us from new with two remote fobs. We have tended to use the one remote and kept the second as a 'spare'. Batteries (Duracell CR2025) in both remotes were changed as recently as 3 months ago and were working fine until yesterday. The 'Used' remote will NOT now open the doors, despite another change of battery, again a brand new Duracell CR2025. There is also no red light showing on the remote when any of the buttons are pressed. The 'Spare' remote however still works a treat and when we changed the battery from this remote into the other, this failed to rectify the problem. If we hold the non-working key fob up to the Stop Start, the car's ignition will start but then a warning comes on the instrument panel indicating that 'Key Not Found'. Wondering whether the fob itself has failed and needs replacing or we have overlooked a cheaper and quicker solution here. Any advice or guidance would be both much welcome and appreciated. Thanks.