Where can I get another kessy fob for my Octavia Vrs Mk lll? Tried Timpsons & they said it's only available from dealerships.

It will be a main dealer only for these. Or TPS may sell them but it will need to be reprogrammed to the car.

So - you will be able to get Timpson's to cut the "key" part (if that bothers you), but agree with @Ecomatt that the dealer will need to programme in the new key.  Recommend you get a new key from them, get them to programme it in and then go and get the key-part cut for your emergency "get into the drivers door" bit.