Income: Employment income rules - Specific payments and benefits in kind excluded from employment income for tax credit purposes: Car Parking
The Tax Credits (Definition and Calculation of Income) Regulations 2002, Reg. 4(4), Table 1 (Item 4).
Payment or reimbursement of expenses in connection with the provision for, or use by, the claimant as a person holding an office or employment of a car parking space at or near their place of work.
This is identical to the income tax exclusion (see Employment Income Manual para EIM01030)