Mortgage possibility with debt?

We are wanting to buy our first home but have quite a bit of debt due to periods of unemployment- about 15K worth. It is all sustainable however and we never miss a repayment. My partner earns 28K and I earn 21K. My parents are going to lend us a deposit of 20K but with our debt is it likely we would be able to get a mortgage? We are in the south east of England and would like to buy something about the 180-200K range but are not sure if this is possible, or where to start? Do we see a financial advisor and if so do they charge us or do we just visit the banks? Thanks