After your credit period (for example 30 days) there is no hard and fast rule on how long you should wait before taking further action.
The following is an excellent link that provides an interactive questionnaire on process to follow when chasing a debt.
If you would like any further information, please do not hesitate to contact Southside Accountants Wimbledon & London.

The short answer is no, you do not have to be an accountant to submit accounts to Companies House. However, it is would be best to employ services of an accountant. He/she would ensure all the changing regulations are complied with. Further, the accountant will be able to identify any tax savings. These tax savings may outweigh their fees.