FTP issues

[#1]

I've been having issues with ftp all day.
Basically the client, or command line, will connect but fail to transfer the data up to the external site.  I've tried my usual work sites both with and without vpn connected. 
Also tried my plusnet ftp account with the same issues.
Have rebooted router, pc, checked with another pc.  FTP on my internal net is fine.
Was just wondering if anybody else is having issues before I raise it with support.
Cheers
Richard

[#2]

Have you exceeded your usage allowance so that FTP has been blocked?

[#3]

Nope, Just started a new month a couple of days ago.
Further investigation reveals that it's not just ftp that's not running correctly.  Some Tracerts are failing and some websites are timing out.
Must be the weather