... or go a bit further on the Liverpool Street line, get off at Rochford, and get a taxi to Southend (EGMC). Five minutes max in the taxi. Has Approach and Tower, NDB and ILS, and several flying schools.
Also has Customs and Special Branch, so you can do your foreign trips - even go to Calais for circuits, where it's cheaper and more fun...
The only drawback: you might meet me there.