Well, the vet took blood from Polly (and she was as good as gold, never even flinched - bless!), and the good news is that the test results are fine, also the urine sample that my husband chased her around the garden for was fine too!! However, the vet has said that it was probably some kind of fit/seizure and that she could have an MRI scan, however, as she has only had one of these 'episodes', I am loathe to go down that route unless they occur regularly. So, fingers crossed it won't happen again. Polly is fine, her usual self. Thanks to everyone for your support. Will try to post some pix in the near future! BJ x