Ground Bound
The cafe in the terminal at Southend is fine, not haute cuisine perhaps, but very honest fare, large portions and reasonable price, too.
If you arrive from 0800 to1100 local time, on a week-day, the airport are doing a special promotion for pilots at the moment, whereby a free breakfast in the terminal cafe is provided as a part of the landing fee. Just mention it when you arrive in the FBO and they will give a voucher (obviously only one per aircraft).
All you have to do is get up early enough to arrive before 11am local.
Details on their website
Southend Free Breakfast