Where's the NDA line? I will not promote.

For context I'm in the pre seed stage. A huge VC I contacted just got back to me. They asked me to send in a fully costed business plan so their investors can review it. They also gave me contact info for their start-up group, but they focus UK start ups, I'm in the USA. I guess in my head, I thought my initial email pitch would lead to sending them my pre seed deck, maybe even a meeting to present it! But I dont know, sending them a fully costed business plan in the 2nd email with no security seems like a huge step. I'm just a dude who's good at connecting dots, and I'm starting to get tangled up with some big names. Advice? 🫠 I solemnly swear that I will not promote.