I think the mower in question is ....possibly....same as purchased last year by someone I know. Blade simply bent. There may well have been a stone, etc in the grass but if so it was not seen or has been since. B & q exchanged it without quibble for different model. I had purchased a mower from homebase that developed a fault just a few days after its warranty expired but secured a replacement so always worth a try. I understood the question and it was clearly answered by everyone but I offered advice too out of concern and with a view to assist because she will receive help as i have described. Hey, Xmas soon. Happy Christmas everyone.