If you were reading yesterday, I promised you a multimedia special including the solution to the tantalising question: where have I lost my BBC pass?

The answer is just to the right of the Citroen:

Yep, I tossed my BBC pass to one side on the grid at Silverstone as I prepared to film this piece to camera. It was clicking against my jeans and I didn't want the unnecessary noise. As I threw it down onto the grass verge, I made a mental note: "Don't forget to pick that up."

I forgot to pick it up and, having done the filming during a short break without any cars on the circuit (bar the Citroen), only remembered once Porsches and Ferraris had resumed thundering round the track at hundreds of miles an hour.

So, lying as it does on a stretch of grassy verge almost inaccessible to man, my BBC pass has probably found a new permanent home just next to the fifth grid position. Look out for it at next year's Grand Prix.

Yesterday's filming at Silverstone was a marvellous, jaw-dropping experience. We'd gone along to report on a young man from Maidenhead who, aged 15, has a bright future in motorsport. He'll most probably go on to become a touring car ace, but you never know - he might just be the next Lewis Hamilton yet.

The filming was a treat in itself. We shot interviews in the Silverstone pit lane, then I perched in the back of a Renault Espace, filming our kid in his souped-up Citroen Saxo as we did a slow-motion lap of the Grand Prix circuit.

Ever since I put this date in my diary, I've had a dream of recording a piece to camera with cars buzzing past my ears while walking gingerly down the grid to the start line. I was amazed to discover we could make this a reality - and, having jumped a fence, enlisted the Saxo to roar past me as I bellowed an impromptu script to the camera. The image above is taken from the middle of this. It's one of the most exciting things I've ever done.

That said, it has competition for that honour from the laps of Silverstone I spent as a passenger. Some of the cars idling in the pit lane were literally worth millions of pounds, and we were offered a seat in one of only two Ferrari F50 GTs in the world. The father of our racing starlet was kind enough to offer us a lap alongside the young maestro, first in the Citroen, then - unbelievably - in a Porsche 911.

I could feel my guts scream with anticipation as we roared out of the pit lane, slamming round the corners, thundering over the rumble strips, and lurching from side to side as the tyres fought to grip the legendary tarmac.

To think I used to try to nip over the grassy bit of the chicane on Formula One computer games. In real life it turns out it's bad enough being on the tarmac, without going cross-country. Then I looked across at the driver. Here I was, in a Porsche 911, being hurled around a world famous motorsports venue... by a 15-year-old.

And he's a much better driver than me, I can tell you. No wonder he's already top of his junior championship with a deal to drive at senior level next year. I've added him to my collection of future sporting legends - I now have interview footage of a potential British number one tennis star and, who knows, maybe the next Lewis Hamilton. Va va voom.

PS As regards this being a "multimedia special", the caveat is: only if you're on Facebook. I only had time to upload the final video piece there earlier on. Think of it as an incredibly small incentive for you fuddy-duddies out there to sign up. By which I mean all our parents.