As far as I'm aware it will be a new radar head at SEN but whether the SSR data will come from elsewhere I don't know as I'm not privvy to their plans in that respect and it's not my area of expertise either I'm afraid.
I haven't heard anything about a CTR being established for SEN but I would have thought that may be necessary sooner rather than later.
The new terminal ground works are coming along well and I believe the piling for the steelwork begins next week.