As a start Kev, see
Welcome to MGIS for the complete accession data for all the participating genebanks in the MGIS. Search the ITC for info on the international genebank curated by Bioversity International.
One slight concern I have about submitting material to the ITC from hobbyist sources is that often the IDs are not certain or correct and the information known about them is very small. I just suggest that if anyone has material for submission to the ITC, gather as much verified information as possible about the exact accession you have, not just to look up information about what it should be like.
See this document below for the type of information that should be submitted with each accession. It is not required that all or even most of the descriptors be submitted with the accession, but as many as possible are best. The descriptors list was not created for use on plants other than A or A+B triploid edible cultivars, so it will not completely accommodate all the different Musaceae out there, but its a good start. There is some work started on creating a new descriptors list which would work for any banana, but that project is just in its beginning.
http://bananas.bioversityinternation...riptors_en.pdf