TCAS FAN, "I refer you to UK AIP ENR 1.6, para 1.4.1 which specifies this." very interesting ! I would love to know why the procedure allows a platform at 1,500' where the base is 2,000'. I feel sure there is a story there? it looks at first glance that an aeroplane maintaining 2,500 to the west and be within the airspace till capturing the glide but I guess not.