I heared a rumour yesterday that apparently there are to be new rules regarding Level 3 (Outsize Luggage drop off).
Staff will be subject to remove their shoes 100% and you will not be able to go Airside to Landside via Level 3. You have to either go through Central search, Turnstyle up by the security lodge or have to go via Baggage reclaim and ask them to open customs doors. Not sure if there is gunna be more change along with this.