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hi becky its def one of the ulva weeds but maybe not lactuca there are quite a few similar species and this seems a bit thin
To find out about what's going on in the south west check out http://www.ispot.org.uk/forum/8409
There is a good chance that this IS U.lactuca but it is simply not possible to tell without close examination (supporting photos), probably with a microscope
See - http://www.discoverlife.org/mp/20q?search=Ulva+lactuca BUT what a pity there are no side b sides of other Ulvae sowe can see clearly what differences!
Lat/Lng: 50.5609, -4.9289
OS grid ref: SW926775