Its a ford racing block so you should be able to order it from your local ford dealer.
Just found it on page 95 on the ford racing catalog.
Kent block # M-6010-16K
Lotus block # M-6010-16L
You could just go for a ford starter solenoid, you'll just need to change out your spade connectors to ring connectors.
Quick google search got me this website.
I usually run doors but no door mirrors. I use the 'mirrors for sevens' rear view mirror that clips on the top of the windshield. Got it from mirrorsforsevens.com
Looks like Croc had the same issue. Found a thread about it.
"For the next US-based sucker who asks this question, WIX oil filter part number 51335 can be found at Rock Auto in Atlanta GA."
Check the brake light switch. If its a caterham you can access it by taking the pedal box cover off. I've had to take mine apart and clean off the contacts.
Surprised no one made a comment on the show. I for one, didn't like how they showed the vendors as if they were part of caterham. Team dynamics were the ones making the wheels and the frame is out sourced too.