Sudden Slow Internet (for the past month or two)

Hi all,
I've had my iMac since December 2009 and it's always been well behaved.  However, in the past couple of months, the internet speed has been inconsistent to the point where it is now pretty much as slow as it could ever be.  Web pages take minutes to load, Dropbox is a no go and Skype just cuts out.
As well as the iMac, I have a Macbook and an iPhone and the internet on these is still as fast as ever.
I rang my internet service provider and they did a few rough tests before claiming it was the Mac that is at fault, especially if the laptop and phone speeds are okay.
So I just wanted to ask, are there any causes for slow internet?  Is there anything I can do?  Shoudl I investigate further with my ISP?
Ben

Please answer as many of the following questions as you can. You may already have answered some of them; in that case, there's no need to repeat the answers.
Restart your router and your broadband device, if they're separate. Any change?
If possible, connect to your router with an Ethernet cable and turn off Wi-Fi. Any difference?
If you can connect to more than one network, are they all the same?
Is networking always the same, or is the problem intermittent?
Disconnect all other devices from the network. Any change?
Boot in safe mode and test. Any difference?
If possible, turn off Bluetooth and disconnect any USB 3 devices. Any difference?

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