TCAS FAN
I looked into that anomaly when SEN was planning its runway extension. If the SEN TODA had been in excess of 1799m at that time it could have probably added to it by virtue of the pavement extension, but as it was less than 1799m the Code 3 TODA rule under CAP 168 applied. I can only assume that some form of Grandfather Rights are recognised by the CAA with respect to SOU.