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Does anyone know what this is please?

It has appeared in my flower garden and has grown very quickly into a good sized clump, about 15 inches tall.

I think it is possibly some kind of grass.

It could be an Iris (more likely if the soil is usually damp where it's growing), or a plant that's appeared from nowhere on my plot - don't know what it's called, but it grows tall reddish brown stems that bear small round buds which open into pretty orangey red flowers.
Hope that's of some help.

It could be a red hot poker plant

Can you put up a bigger pic... ? its hard to see this small one.

It could be crocosmia, also known as montbretia. 
http://apps.rhs.org.uk/plantselector/plant?plantid=579

I'd leave it be and see if it flowers, then you can decide either to keep it or dig it up if you don't.

Sisyrinchium maybe?

Thanks for your suggestions.  I know all the plants mentioned and it's not any of those.

I don't think it has much chance of flowering BTW as I keep finding the tops nipped off and thrown on the ground (very odd)

Perhaps this close-up will help.

further to the above - I thought sisyrinchiums were those small plants with the blue or yellow star flowers.

However, I've just googled it and find that there are many different ones, some of them quite tall - so - that is a distinct possibility.  Thanks, tomatoada, you may well be right.

From the close up it looks more like wheat.  Is so perhaps thats why birds could be pecking at it.    I have both types of S. in my garden.   

defo sisyrinchium, or as commonly known around here as satin flower, small yellow flowers, leaves that turn black at the ends when it starts going over. Not one of my favourites but a good space filler.

We have that, I think it is a terrible weed.  Seed pods are quite attractive.