certainly look like them. I think the leaf is just a narrow variant. I get quite a few odd leaved forms courtesy of the birds.

Taste one carefully - you can always spit it out. I have seen fungus experts do this with mushrooms so it must be OK as long as you don't swallow any. (Somebody will probable correct me here)

Thanks for your answers. If they aren't blackberries, I don't know what they can be. (I am asking the question on behalf of my son-in-law. Neither of us is too keen on the idea of poisoning my grandson!)

I have seen these and don't know just what they are. Certainly the same family as blackberries and unlikely to be poisonous.
Did your experts grow any larger or smaller, steragram ;-)

I wonder if it is one of the crosses between raspberry and bramble?

This should help, a client of mine has a Thorn less variety which sends up suckers occaisionally, it has been noted that these have produced smaller blackberries similar to yours in the picture these are carried on thorny stems which have serrated type leaves like yours.

Thanks to all of you for your suggestions. Everything about them suggests that they are blackberries apart from the shape of the leaves. They could well be a cross, I think, Mg. The garden is a large one (they moved recently) and there are quite a few brambles/blackberries growing which could have planted some years ago. Julien - your explanation seems very likely - suckers abound! Thank you.

I think it's a Cut-leaf Blackberry, also known as an evergreen Blackberry (Rubus laciniatus), as opposed to the normal wild blackberries that are more common and known as Himalayan blackberry (Rubus discolor). I think that the Cut-leaf Blackberry is normally a domestic grown fruit, as opposed to a wild blackberry. It is perfectly edible but has a milder flavour than the wild variety... Suck it and see as they say.

Thank you Myron - that is good news! After googling the images, I think that is spot on.

Lol Bulba - Not while I was watching!

Yes definitely edible blackberry, I had one identified in my garden by Geoff Stebbings, editor of Garden Answers magazine, when he was doing his Biking Gardner articles.

Thank you Patfran, that is good to know.

I just want to let you know that the blackberries have been gathered, eaten and enjoyed! Thank you all very much for your help.

Ah! thank goodness for that. Everyone's been holding there breath on this site that they were indeed edible. LOL

LOL indeed! Now you can all sleep soundly!