Please read the following table in Markdown format and then answer the question according to the table. Table cells in one row are seperated by '|', and different rows are seperated by '
'.

Table:
| Round | Name | Circuit | Date | Winning driver | Winning car |
| --- | --- | --- | --- | --- | --- |
| 1.0 | International Gold Cup | Oulton Park | March 24 | Tony Trimmer | McLaren M23 |
| 2.0 | Evening News Trophy | Brands Hatch | March 27 | Tony Trimmer | McLaren M23 |
| 3.0 | Anglia TV Trophy | Snetterton | April 16 | Tony Trimmer | McLaren M23 |
| 4.0 | Sun Trophy | Mallory Park | May 1 | Geoff Lees | Ensign N175 |
| 5.0 | International Whitsuntide Race | Zandvoort | May 15 | Bob Evans | Surtees TS19 |
| 6.0 | Donington Formula 1 Trophy | Donington Park | May 21 | Giancarlo Martini | Ensign N175 |
| 7.0 | Radio 210 European Trophy | Thruxton | May 29 | Tony Trimmer | McLaren M23 |
| 8.0 | Oulton Park Formula 1 Trophy | Oulton Park | June 24 | Guy Edwards | March 781 |
| 9.0 | Dave Lee Travis Trophy | Mallory Park | July 30 | Bruce Allison | March 781 |
| 10.0 | Fuji Tapes Trophy | Brands Hatch | August 28 | Tony Trimmer | McLaren M23 |
| 11.0 | Radio Victory Trophy | Thruxton | September 10 | Guy Edwards | March 781 |
| 12.0 | Budweiser Trophy | Snetterton | September 24 | Dave Kennedy | Wolf WR3 |
Question:
What car did Tony Trimmer drive at the Oulton Park Circuit?
Answer:
McLaren M23