In rock pool
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...pretty sure this is Chondrus crispus - you're second choice (you wouldn't pick up the irridescence in this pic as the tips need to be right at the surface of the water). If you post a new ID I will agree with you.
... you're being really naughty as I have already IDed this as C.crispus - however have asked Paula to add her second ID and would add my agreement to this :(
Thanks both - it looked a bit 'scruffy' at the ends which is why I thought maybe Mastocarpus rather than Chondrus but I wasn't at all sure!
Lat/Lng: 51.7239, -4.6828
OS grid ref: SN147062