Spent convictions need not be declared in accordance with the Rehabilitation of Offenders Act 1974. Any information provided will not disqualify you from consideration for the post applied for.
Have you ever been convicted or found guilty by a court of an offence in this country (excluding parking but including all motoring offences), or have you been put on probation or absolutely/ conditionally discharged or bound over after being charged with any offence, or is there any action pending against you?