I think the Electrostars with 3+2 seating have a very narrow aisle. This is particularly noticeable with the 357 variant with c2c, but also can be seen on the 377s. The 350/360/450s are virtually the same too.
That said, I used one of SWTs 458s the other night - the aisle on those with their 3+2 is much worse compared to a 450. I know the Juniper seats are fairly comfortable, but is a pain to walk down compared to a equally packed 450!
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Just found this company on google.
They seam to be a Design specialist working on 700
http://schoenemanndesign.co.uk/portfolio/
Some interesting pics on there.
Urgh, yuck. Some Interesting finds on there and some unpleasant ones too:
The original renders for the Class 180s having a Barbie interior with GWT Green seats for example, or the worst being the original proposals (just as the same time as FGW is distancing itself from First into the smarter Great Western Railway) for National Express Great Western // NXGW with drab looking 153s, 158s, 321s? and some interestingly odd new train proposal from NX - http://schoenemanndesign.co.uk/2013/01/14/876/
The more I see how depressing those NX colours are, the more I'm glad to look at the First Group colour pallet! I'm possibly in the minority in thinking that the Desiro City for Thameslink looked rather good in FCC livery too!