Have a look on here:
http://www.worldmedals.co.uk/Rib/britribb.htm
The first four (from left to right) seem to be quite straightforward:
1939-45 Star
Africa Star (with 8th Army clasp)
Defence Medal
War Medal
The last one however, I'm not totally sure about - have the colours faded at all (what are they like on the back)? For my money though, I think it's the Efficiency Medal (for time served in the Territorials).
HTH,
Kevin