Last year it came to light that a client had omitted to include a chargeable gain on an earlier year Return.
A disclosure was made to HMRC & a computation of the outstanding liability was provided.
HMRC responded to acknowledge receipt of the computation but claimed to have misplaced the covering letter. A copy of the letter was sent.
HMRC have taken no action since and as the client has not been asked to pay anything he feels that he need take no further action. Is this reasonable? Any other issues to consider?