Firstly, thanks to my respondents , for the advice & reassurance. The day with the grandchildren has been fine. They were on their best behaviour & I did feel it was easier up & down the stairs there today (I live in a flat). However, I developed a migraine come tea time & whilst I do suffer from these occasionally, must make a note of same.....it could be due to watching the Transformers film in 3D on their giant screen !!!