Emergency Key / Proximity Key problems

[Chaz66]

Hi All

My first post, be gentle if I'm just being a twit.

New car to me in December, 2008 1.5 manual with 164,000 miles on the clock. 

I was getting fed up with the bleeping as I was locking the car and I wondered if turning the ignition barrel to 'lock' would cure this. Yes, it cured it perfectly... However, I now have to use the emergency key to start the car every time. I've looked in the manual, tried goggling it, etc. and I can't find anything on how to restore the lock so I can use the proximity key function again. Please help if you can!

Many thanks

Chaz