Thanks very much indeed for your replies.
I had skimmed past the 'new beta experience' bit on the too-hasty presumption it would not have a bearing on this issue. I will pass the beta method (as posted by boriscleto) on to the person concerned.
To be honest even had I spent longer poking all the beta icons & options on the photo page I would probably have overlooked the push pin anyway, expecting a similar drop down 'grab the link' menu as the non-beta - & if I were someone who didn't know much about links, code & the like it doesn't really help that there is no mention of forums or BBcode to help you out. At least the non-beta has something...
Personally I would be ok with either method but the person concerned would definitely not want to delete extra code, & I wouldn't really want to give them any more steps to follow than 'go here click this' etc. I suppose it also remains to be seen what form the final beta options take as they are still trialling stuff it seems.
Thanks again for your prompt answers & for saving me going further round the houses; have to say Flickr is the least idiot-proof site I have tried out so far, never having used it myself, & so coming to it totally from scratch (& with at least a reasonable bit of knowhow).