If you are currently employed in the tobacco trade
As you are currently employed in Grocery you will need to evidence your employment in one of the following ways:
Your last six months of payslips, (if paid weekly, one for each month) including your most recent.
OR
Your last P60 and most recent payslip.
If you are not currently employed in the tobacco trade
As you are not currently employed in the tobacco trade you will need to evidence your previous employment (at least ten full years) by uploading your P60's for each year of employment.
If you have not kept your P60's then you could request a report from HMRC showing all the employers you have worked for here. Please be aware this may take up to six weeks. Please do not apply until you have your report.