TU records and credit rating will still be adversely impacted by the debt consolidation.
Impossible for anyone to tell you what chance you have... if you haven't been upfront about past financial position in the application but now have reliable income and are settling your past mistakes in a structured and manageable way then prepare some documents to make that case and supplement your application. If it is still a mess then stay quiet and hope for the best.
Immigration officers are just people applying a combination of basic rules (which i presume you have passed), plus judgements on the grey areas (incl. financial position, marriages of convenience) and substantial biases based mainly on brown-ness and nationality. Making judgements requires justification, so you have some power to influence the last two by giving them firm documentation to help support their decision.