One of these has the wrong ribbon for the medal - the navy blue, red and sky blue ribbon is for the 1939-1945 Star, awarded to anyone with overseas service during that period. It's attached to an Africa Star, awarded to those with service in Africa in the period 1940-43. The medals with the red, blue and white ribbons both appear to be the War Medal 1939-1945, which was awarded to those with a month of service during the war. I don't have any information on the final medal, but it appears to be a simple overseas service medal, that would be awarded to all with overseas service. The British Government's webpage on medals is reasonably comprehensive on them, and includes pictures for some.

The final medal is something quite interesting -- I've never seen it before. Speculatively, I'd guess that it is an unofficial badge of some sort as it lacks the "finish" of minted medals issued by HM Government and the late King's dominion governments. It may have been issued by a local authority, privately issued by a senior officer or even had some sort of quasi-official significance. If he was wounded, he may have worn that badge alone in civilian clothes in order to demonstrate that he wasn't a "shirker" although instances of "white feathering" were considerably less prevalent during the Second World War than it was during the First.

If you do indeed still have those medals from your uncle you should immediately attempt to redeem them. Keeping medals as anything other than medals is considered extremely offensive by ex-servicemen and, in addition, it's a shame to keep them separate. You should note that your medals should have your grandfather's name and service number on the rim of the award, which would allow you to access his regimental records. If he was an officer, he'll probably have a more detailed service since many regimental associations issued rather advanced war histories in the years following the conflict. You can contact the National Archives, Kew in order to get a very brief official record should you choose to do so. Note that you must be next of kin to make such a request, meaning your grandmother must have also passed.

Finally, I'd like to point out that the number of medals your grandfather may have is not indicative of his worth as a soldier. This is a frequent mistake. There are several extremely distinguished British and Commonwealth soldiers who have a handful of awards in contrast to American units, in which privates may have the same number of medals as generals.

Hope this was of some help!