In message , Therefore
writes
I have just purchased some bulbs or are they corms ?

If you're referring to Persian Buttercup (Ranunculus asiaticus) they're
tubers.

However , I am at a loss as how to plant them.

Which way up should they be tendrils up or tendrills down.

Google is your friend, though in this case it's a bit reluctant to
oblige, particularly with an authoritative site. However, the answer is
"claws" downwards.

http://web.extension.uiuc.edu/lake/downloads/8783.pdf

(Extension service at University of Illinois at Urbana-Champaign.)

--
Stewart Robert Hinsley