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Agree with the ID. The only other species it could be confused with is the flounder but flounders are more rhomboid in shape and their orange spots, if they have them, are much duller. What I relatively recently found out is that plaice and flounder occasionally hybridise, which presumably makes ID a little tougher!
To find out about what's going on in the south west check out http://www.ispot.org.uk/forum/8409
Lat/Lng: 51.7099, -5.168
OS grid ref: SM812059