Is it much harder to get to (from Euston, say) than Gatwick or Heathrow?

Has the new airport train station opened yet? Once it's open, it'll
be 52 minutes from Liverpool St, the same as Stansted, and similar to
KGX to Heathrow on the Picc, albeit slower than Heathrow or Gatwick
by fast train.

Until then, depends how many taxis there are at Rochford.

R's,
John