What does a successful Vacation Scheme/TC Offer Email look like? I'm just curious. (Do they need you to provide Scans of your passport? etc.)

I'm just curiouso_O
An email will usually have a attachment that is a formal offer letter. There will be various terms and conditions attached to that offer.

At some point before you start, you’ll need to present your passport. This typically has to be seen in person - scans are not usually sufficient.
 
You'll also be informed of the next steps of the process (such as referencing, eligibility to work, etc). The offer letter will contain all the clauses you have to meet (passing the SQE/LPC/GDL, providing transcripts, etc).

They usually then follow up with an employment contract (although some firms will tie the offer letter and the employment contract in one email).
 
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