SSD - I only have USB 1.1 sockets on my PC/Mac - will the Integral External SSD work with them?

Yes. It will work, however this will reduce the read/write speed of the SSD. To benefit from the full speed it is advised that you use a USB 2.0 socket. If it is possible, use a FireWire or eSATA connection, they will both provide a faster connection then USB 1.1 and USB 2.0 connection formats.