This won't be a "fishing" expedition in the normal sense. The OR will have information either from the previous directors or from company records that a payment has been made to the OP and the explanation is either unknown or suggests the payment was improper. The OR has a legal duty to investigate this.
Do not ignore this either, the OR does have powers to examine persons in court if they deem it necessary. It's not normally needed as they rely on voluntary co-operation (or it may not be prudent from a cost point of view for small sums).
The government
does not always get first dibs. They are a preferred creditor for taxes withheld at source (e.g. VAT or PAYE) but in other areas they rank equally to other unsecured creditors.
I don't actually remember what the exact priority order is but I think it's vaguely:
- Creditors with fixed charge security.
- Liquidator fees.
- Preferred creditors (e.g. employee unpaid wages or stat redundancy, HMRC VAT/PAYE)
- Creditors with floating charges.
- Everyone else (e.g. employees non-stat redundancy, HMRC CT, general business creditors).
- Shareholders
Do NOT rely on that list, it's been over a decade since I learned it and I've forgotten it now.