I got my first choice of times. Leaving 8:15 on Thursday (in time to get there from North London and miss the morning traffic - getting to Rouen after their rush hour. Then returning at 12:30pm on the Monday, so leaving (quite) early morning, but allowing enough time for my brother to get back to the North West for early evening.
This is one of the best bits of Le Mans. I reckon I can have 4 nights there and a whole weekend of racing for less than the British Grand Prix.