Jack-in-the-pulpit

Thank you both, I agree with the both of you. It was only a single plant, there were no more so I could't make another photo. Thank you both for answering my question!

I agree with Charlotte that it looks like the US Jack-in-the-Pulpit. It may, however, be an English plant known by a number of common names such as Cuckoopoint or Lords and Ladies - and Jack-in-the-Pulpit - (Arum maculatum).
http://www.thepoisongarden.co.uk/atoz/ar...

I made a suggestion of Jack-in-the-pulpit which is a woodland plant we have here in the USA that has similar berries, but since I couldn't see the leaves and I don't know if you have it in the UK check out my reference and see what you think.