My dyson dc27 won't suck up there is a blockage from one off the hoses but which one I do not know please some one can you help

Dysons are easy enough to take apart.
Go and grab the user guide from their site which will help you.
http://www.dyson.co.uk/medialibrary/Files/Dyson/Support/downloads/UK/floorcare/Manuals/dc27_uk_manual_alf_120710%20pdf.ashx

Also try their support: DC27 (http://www.dyson.co.uk/support/dc27/dc27-all-floors)