The British Library is no longer supplying dissertations/theses for loan in microfilm format, and will in future provide them in digitised format via their Electronic Theses Online Service EThOS.
Where disertations/theses have already been digitised, they are available as a free download ie. there is no longer a need to make an Inter Library Loan request for these items.
In order to search for titles, users need to register. Details available at ethos.bl.uk.
If the dissertation/thesis you require is not yet digitised, you can order it directly, although you may have to wait for a couple of months as demand is high.
If your need to consult a dissertation/ thesis urgently, please let us know and we will contact the relevant University and ask if they are willing/able to lend the hard copy to us.
Try also the Index to Theses: a comprehensive listing of theses with abstracts accepted by universities in Great Britain and Ireland since 1716.