I have an excel workbook that started as 148kB and is now 2.6MB, but the size
increase is for no apparent reason, I'm not aware of doing anything other
than forwarding it by email to a colleague. When I check one of the sheets
it shows the last cell to be at row 27364 even though there is nothing beyond
row 26, but I can't seem to clear the range. There are no spurious
characters that I can see, what have I done?