To be concerned I've heard nothing?

[dododoooo]

I am due to start a new job next week. Two weeks ago I was told I would shortly receive instructions for my first day and where to go (it's multi-office office based), as well as full documents from Human Resources.

I have heard nothing. Should I be worried? I have left a job for this job, so if it falls through I'll be stuffed!

Checked junk etc?

Worth dropping them an email/call to find out where they are.

Yep I would email them and ask. In my company (which is 100% remote), they don't send the login info etc until the working day before the person starts, so if they were starting on the Monday, they would receive the info on the Friday beforehand.