Hi thanks for the replies people!
Sadly I just measured my desk at 190cm. There is no way they'll fit.
Each horn is 29cm wide, smaller speaker is 20cm diameter so looking at 60cm per side to accomodate breathing space between each speaker. 30" ACD is 69cm wide. So that only leaves basically 5cm of room between the speakers and monitor.
So, any one able to suggest a suitable replacement for these. I am absolutely gutted, I've been looking at them for 2 months and with the £80 it seemed perfect but it seems a no go.
I've had a look at the "Razer Mako THX Certified 2.1 Speaker System" on OcUK. Seem a lot more powerful etc, so I'm thinking of going for those instead. Unless you have any recommendations, must be less than 30cm wide though.