Use form PRT60 to claim for any abortive exploration expenditure incurred before 16 March 1983.
Ref: PRT60 https://public-online.hmrc.gov.uk/lc/content/xfaforms/profiles/forms.html?contentRoot=repository:///Applications/CorporationTax/1.0/PRT60&template=PRT60.xdp
Use form PRT60 to claim for any abortive exploration expenditure incurred before 16 March 1983, if you’re a participator in an oil field, to be allowed under Section 5 Oil Taxation Act 1975.
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Related forms and guidance
If you’re a participator in an oil field you can use form: