Hi again guys.
I tried both of your suggestions, but to no avail. It still refused to show any Flash on the PC systems at work, although it worked fine pretty much everywhere else.
However, after almost an entire afternoon of head scratching and failures, I eventually stumbled upon this:-
SWFOBJECT
Took a bit of getting my head around, but I've got it working now, here at home.
The proof of the pudding will be tonight when I head into work and check if it shows up there on the systems.
I've used V1.5 but if it works fine, I'll switch over to the V2.0 version linked to from my link above as it appears to be slightly more flexible.
I'm keeping my fingers crossed, will let you know if it works!!!