If the 'nominal' purchase amount is due to the fact that this is all the company is worth, there is no problem. (Bear in mind, however, that if there is value in the company, you will be deemed to have sold your share at 50% of that value, even if you accept a nominal sum.)
Regarding the directors' loans, there is likewise no problem: what simply happens is:
1. Other Director makes further loan to company (no problem there)
2. Company, now flush with cash, repays your loan (no problem there either)