Just had a loot though the rest of your shots from here, some great shots. That 135mm looks a lovely lens. Looks like you had some really great light at times, I know it's not nice when there's rain or a threat of if in the air but it can great great light when there's a gap in the clouds.
I wish Donington had more open areas like this, MSV have really gone to town with the fencing and what's worse is they've now started putting a second barrier about 8ft away from the catch fencing meaning no chance of getting a clean shot. I know why they have to do it these days, but it doesn't make for good photography. There's only one place where you can get track level fence free shooting on the national circuit which I'll do again on Sunday but I'm going to try to find some different angles as I've done all the 'classic ones' and I need to do something different. Ideally I'd blag a press pass