I moved to Eastbourne from Surrey a year ago, and my commute for work is the A27 to Hove.
I've never seen any kind of speed trap / camera van / Gatso, etc either permanent or temporary. This MUST be a hotspot area for them especially on the dual carriageway segments, so where are they?!
*Obviously I drive like a little old lady, but I'd imagine someone engaging in spirited driving along that route might find such information useful.