If thats stoke seat as in stoke-on-trent no wonder they want to charge £90 robin gits.
Been stung there myself too wont go into to much detail lets just say i wont use them again.
If its a key you need try ebay, bought a flip key for £5 got a new blade £3 got it cut at timpsons £5 put the chip out of old key into new one and recoded with ignition 5mins job done. new flip key for less than £15.
As for been able to lock the drivers door if it locks using the switch inside then i would just sort your key as most people remove the barrel anyway as it is a common security issue with vag cars.