The springfield one is mentioned by Castleden in his 'Neolithic Britain'. Itwas by the river at TL726066, ith the ditches only1m deep, running SW-NE for 670m! They were 40m apart, and within them was a C-shape (originally circular?) set of post holes, diameter 25m.

Also for Essex he mentions:

Stone Point (Walton on the naze) TM248257 - a settlement site of pit dwellings
Tye Field TM088308 - a flattened settlement site
Orsett Causewayed Enclosure TQ653806 - overlooking the Thames valley, surrounded by three concentric ditches (probably nothing there as only discovered by aerial survey)
Grange Farm Longbarrow, Lawford - maybe a longbarrow, maybe not - it was 1m high and 50m long 'in 1970'.
Little Bromley Henge TM274089 - a 20m diameter circular enclosure with two entrances and a 3.5m wide ditch. Visible on air photographs but not excavated.

So I doubt there's much to actually see at any of these...
but I hope you have a nice time and get out somewhere nice. Mind the rude boys and the turbulence from their Halfords spoilers. Hatfield forest is nice if you fancy something a bit more 'modern'.