maerk – you’re right, the WP site is in a sub directory on a company website so it wouldn’t be possible to put the robots.txt file at the uppermost level.
thanks to both you and doodlebee for your advice – i’ve implemented both to err on the side of caution!!! hopefully i’ll see no more bots.
Otto42 – not entirely sure where i should be looking – i’ve hunted high and low but can’t find what you’ve mentioned in my admin pages…