If the crack is the result of a manufacturing fault, then I would certainly send them an email explaining the problem.
They not entertain a request for repair/replacement, but can't hurt to at least inquire.
When I spoke to Marie in Servicing she said they were 'still reviewing' warranty work but my solicitor looked into it and said I would stand no chance if I tried a 'merchantable quality' claim in court. As stated by Fast Eddie they bought the assets but not the liabilities. Must have been a tough choice........
Best to try a 'loyal customer appealing to your commitment to the improvement of the brand reputation and quality' letter maybe at their new offices.