As promised earlier, here’s a look at the mock up of the interior of Greater Anglia’s Aventra trains. Be aware that this isn’t exactly how they’ll appear In service (it is a mock-up after all). The model has been built to test various layouts, so it’s an amalgam of styles. Still it give you a feel for what they’ll look like in service.
GA have ordered 665 Aventra vehicles. They’ll form 22 x 10 car trains and 89 x 5 car trains. All will be standard class. 5 car trains will have 540 seats and 10 cars 1100.
Features to note include underfloor heating, air conditioning, plug sockets (with USB) and high capacity broadband. The units will be used across the GA network, including Hertford East, Kings Lynn and Ipswich to London. Also GE services including Norwich, Ipswich, Braintree, Clacton and Southend.
The first trains will enter service in 2019.
The seats are cantilevered from the body sides, creating more luggage apace and making them easier to keep clean. Note that each bay has more USB sockets than seats.
The 
I went last week and they were very similar to most other modern interiors with hard seats and not enough toilets 😦 However, on asking Icomera, they have confirmed an uninterruptible 4g mobile (via LTE advance) and very high bandwidth 802.11ac Wi Fi is being installed – best on any train to date 🙂