Hi,
I'm looking for a suitable dissertation topic in accounting and finance.
I'm a final year BSc hons student reading accounting and finance.

Be sure you take on a topic that you can live with and enjoy working on for a number of months!

This site wants to sell you a dissertation, so ignore that part, but it does list a lot of topic ideas:

Free Finance and Accounting Dissertation Topics (http://www.ivoryresearch.com/finance-dissertation-topics.php)