QUOTE(Akuta-Same @ Jun 20 2008, 11:04 PM)

the patch is surroned by what i think are known as barabas bushes (loads of orange berries and MASSIVE thorns that bring you out in a rash)
Sounds like sea buckthorn to me. The berries are edible, although without any additional sugar, they taste like shit.
http://en.wikipedia.org/wiki/HippophaeIf you're plants are only three weeks into flower, the weather might close in on them before the're fully ripe. I think that the salty, ozone rich air might deter any mold in late flower, so you might be ok, if the frosts don't come until the end of october that is.
If sand does become a problem in the bud towards the end, after trimming you can try gently waving each cola under water to dislodge the sand. Even if you can't visibly see any sand in your buds, the're might be quite alot of microscopic sand dust in them, so come harvest time try waving a small branch under water to see if the water becomes more cloudy or if any larger sand particles fall to the bottom. If either happens then you might want to do the whole batch.