Hi there, yes you can, however you cannot show with cropped ears.
Here is some information about how to go about it:
http://www.thekennelclub.org.uk/item/366
Import - FAQs
How do I register my imported dog?
To import a dog a photocopy of a certified Export Pedigree should be sent in, unless it is a country which does not issue Export Pedigree's in which case a Three Generation Pedigree is sufficient, with the Import Application Form 4.
If the Export Pedigree or the 3 Generation Pedigree do not show the current registered owner, a copy of the Owner Registration Certificate issued by the overseas Kennel Club, showing the current owner, needs to be submitted as well.
For a dog coming from Germany an owner needs to submit a photocopy of the Ahnentafel issued by the breed club accompanied by the Annerkennung Fur Das Ausland (Export Document issued by the VDH)