I am retired, but my ex-partner has posed the following question. He recently took on a new client who is under HMRC investigation. He has spent 8 hours compiling a letter to SOCA plus the usual marker letter to HMRC in Llanishen. He has sent her an invoice for £1600 plus VAT in respect of this work. The invoice simply refers to 'tax work to date'. Sadly, the client has now asked for an analysis of the invoice. How should my ex-partner respond without tipping her off?