THanks. Must admit, my two dogs have been acting a bit strange since that episode. I forgot to post in the original message that I had felt it for around 20 or so mins whilst in the house, then went outside with my mutts and all of a sudden there was this really concussive like wave followed about 2 secs later by 2 or 3 really loud whumps. It isn't the first time I've felt these, but it was the first time that it went on for so long. Sat here on the sofa at the moment watching TV with one hear on background noise. Imagine what my reactions were when I woke up the next morning and logged on to find out what had happened.You take care overthere and keep us informed.