Increasing Redirect to Voicemail Timeout on O2

When I received by lovely new HTC Touch HD I found I kept missing calls as there was a slight delay between the caller calling and the phone starting to make a sound. I contacted O2 and they told me to run the following command :

**61*901*10*??#

?? is the delay you want in increments of 5 up to 30. I went for:

**61*901*10*25#

Works a treat.

I hope this saves someone a bit of time.