Landscape plates with J Carr & Co and London impressed marks

I got pretty excited when the plates below, with impressed 'J CARR & Co' marks came up at Anderson and Garland last year. I felt sure I'd seen the transfers on plaques.

I've set the plates and plaques side-by-side below, along with details of the transfers.  It would have been great to get a cast-iron attribution for the plaques as John Carr.  I'll let you play spot the difference, but I'm certain they come from different transfer plates. If you are in any doubt, look at the lozenge decoration on the building on the left in the final detail (click to enlarge and move between the images).

The differences between the second plate and plaque with similar transfer are even more pronounced. Note the shadows on the water to the right of the figures.

I felt a bit crestfallen, but then remembered a pair of plates in a pile in my bedroom that I bought some time ago (thanks to Philip Rutherford for drawing my attention to them on eBay). The plates have similar transfers and the LONDON impressed mark over an anchor (see below).

Given the angle of the plaque photos and the washes of enamels over the plaque's transfer, it is difficult to be 100% certain, but these look like a good match to me. (Remember the lozenges on the left house in the third detail.)

Again with the second plate it is impossible to be certain (the transfer on the plaque has degraded), but an altogether better match.

So who made the plaques and the London-marked plates?  Clarice Blakey states in a Northern Ceramic Society newsletter (83) that...
 
The five reported users of the LONDON mark are:
Middlesbrough Pottery, 1834–52
Isaac and Thomas Bell, Albion Pottery, 1860–63
Carr & Sons, Low Lights Pottery N. Shields, 1844–c 1900
Malkin, Walker and Hulse, British Anchor Pottery, Longton, 1858–64
Fell & Co, St Peters Pottery, Newcastle on Tyne, 1817–1890

My hunch is that both the plaques and the London-marked plates were made by John Carr, but the attribution is some way off being cast-iron. If you know better, please get in touch.