Hi everyone....first of all thanks to everyone who replied to my distress call, it's nice to know there are plenty who care and it is much appreciated....Anyway, I got to the hives and it was, as I suspected, a problem with my (home made) stand...it had buckled just enough for the weight of the hives above to topple it. I tried to contact a couple of people from the Apiary but was unable to so I just togged up with an extra pair of jeans and then a sleeveless veil, then my all in one suit and got in there! I managed to acquire a nice, low table from a nearby joiners/antique/reclamation shop and set that in, then started to slowly lift away the box's. The floors were easy enough but the first brood box was propolised to the second brood box and as I was alone, I couldn't lift them both safely so I prised them apart and got myself out of the way for a while then returned to place the first box onto the new stand....I carried on doing this, place a box, walk away, another box, walk away, etc etc until I had completed both hives. Unfortunately I think a few bees met their demise as i was not patient enough in aligning the box's....there were a LOT of bees in the air and they were all trying to chew through my veils!!!!! and a few bees didn't get out of the way fast enough.....there were a lot of Bees congregating on the outside of the hives but apart from all that, it sort of looked OK when completed, .
Within about 20 mins....after a brew, I went to have a look and it all appeared remarkably calm. So, I will wait a couple of days until I go back to try and assess whether they are both Queen right....What an ordeal and one I don't want to go through again....in hindsight, I should have checked the stand more often, I painted with Linseed oil and Beeswax at the start of the season and it all seemed OK.
Having said that, nothing had broken, it just seemed to have moved a little, maybe sunk into the soil as 'Redwood' suggested, and that was just enough for the top weight to push it all over.
So, thanks again everyone for your encouragement and tips....I will try to upload a photo of the stand as it was on first sight.