Cam any one tell me what this is

The flowering plant just appeared in the raspberry canes. I thought at first it was celandine but after a comparison it is nothing like

 

It is a dwarf Tulip.

Possibly one called Tulipa tarda.

http://www.google.co.uk/search?hl=en&sugexp=frgbld&cp=9&gs_id=10&xhr=t&q=tulipa+tarda&bav=on.2,or.r_gc.r_pw.r_qf.,cf.osb&biw=1280&bih=647&um=1&ie=UTF-8&tbm=isch&source=og&sa=N&tab=wi&ei=xK6FT_mXFcSo0AWi8qTUBw

 

Thank you. I can only assume it came in some compost tipped there from a pot last year but how as seed or a very small bulb but it would have been very small