From samknows.com:
28/03/2007 Sky/Easynet has enabled the Calthorpe exchange for their service
14/03/2007 BT Wholesale (SDSL) has enabled the Calthorpe exchange for their service
02/02/2007 Be Unlimited is no longer reporting an enablement date for the Calthorpe exchange
19/10/2006 BT have set a target date of Q3 2009 for the switch to 21CN for the Calthorpe exchange
16/08/2006 Bulldog has enabled the Calthorpe exchange for their service
03/08/2006 Be Unlimited has set an enablement date of 31/05/2007 for the Calthorpe exchange
20/05/2006 Bulldog has enabled the Calthorpe exchange for their service
17/05/2006 Bulldog has updated the enablement date for the Calthorpe exchange to 30/06/2006 (Was previously 31/07/2006)
Doesnt look too good on the BE front!
On the plus side from your postcode you are 440 metres away from the exchange so potentially you could get max(ish) speeds from regular ADSL or sky ADSL2+.
Code:
dslzoneuk.net/distance.php
All the best.