thankyou for all the replies.
Just a quick update (I know some of you may have seen this on his facebook page!!! thanks to my wife Wendy's daily updates!)
..Baggins is back to (almost) normal now (oh god!)..still slight limp but much better. In fact the evening he came back from the vets he went beserk after the pain killers kicked in and I had to catch him after tearing around like a mad one!!
Its such a strange condition he literally went from Monday afternoon from being in agony (anyone would have thought hed broken his leg)..then 48hrs later to almost back to normal - this is the pattern when he has these 'attacks', although this one was the worst.
After speaking to our vets (who are absolutely brilliant) today, he is fairly certain it is Pano. The plan going forward will be to see how he does and if there is another episode then he will be referred. At least now we now what we are dealing with a little more (although technically it hasnt been diagnosed) as to begin with we were so worried that he just seemed to be in pain for no reason.
Also wanted to add that Petplan have been absolutely brilliant - I am soooo glad I took the ultimate insurance with them.
He has his first puppy training class tomorrow so im sure that will be interseting to say the least!