SolvedBIM60165 | Measuring the profits (particular trades): land: trading transactions: reports to BAI Business Profits
From HM Revenue & Customs · Business Income Manual
You should make a report to BAI Business Profits in any of the following circumstances:
where the District Valuer's assistance is sought in a land valuation relating to a trade (BIM51560 onwards), agreement cannot be reached and a Tribunal appeal hearing may be necessary on the valuation point,
in supervening trading cases which may proceed before the Tribunal (BIM60060),
when you cannot reach agreement on the valuation of unsold stock in timeshare schemes (BIM60155).