Hey madrj, welcome.
I’m from the UK as well. Don’t worry about shipping it’s speedy and reliable (by DHL).
Personally I love IS, I even have the 4x strength version (although not recommended for beginners). Definitely a great moodlifter for both yourself and others around you. It will do alright at work but it wouldn’t be my first pick, my first pick would be a314 or IG depending on your environment.
Most of the consumer line products go well with each other, but you’ll need to get a feel for them individually first.
Check out this thread to check what each thing does individually.