This question was answered on 13th December 2022
Estimates of the cost of tax reliefs used by oil and gas companies under the Ring Fenced Corporation Tax (RFCT) and Petroleum Revenue Tax (PRT) regimes are published at
tax relief statistics gov.uk (www.gov.uk). Future releases of these statistics will likely include estimates for first year capital allowances and the investment allowance for the new Energy Profits Levy, once outturn data is available. The estimates in these statistics do not take account of any behavioural effects that would result from removing the reliefs.