There are, unfortunately, scores of men named Albert Robinson in the Medal Cards. It would seem that yours served with a Scottish Regiment - that would eliminate many of them, but you will still be left with a sizeable number of possible contenders.
Some possible strategies:
Absent Voters List of 1918 - if you can get to Newton Heath Library and check if they have the List and then see if you can find Albert listed - it should give at least his Regiment. Try Gorton for Joseph. [A phone call to the relevant libraries might get you what you want]
Did either man marry of have children between 1914 - 1919? If so the relevant certificate may have the information you want.
A long shot - and hard work - is to look through the local papers of the time to see if they are listed: men who were wounded, on leave, were often mentioned - some newspapers even listed everyone in the area who joined up - especially in the early years of the war.
Another angle is to ask the local library if they hold past copies of church magazines 1914 - 1918 - they also often listed men who enlisted.
Having said all that - it is still quite likely that you will not find what you want - it really is a needle in a haystack job, with no certainty that the needle is even there!
Good hunting,
jds1949
