Cross account S3 access

It's now fairly standard that organisations using AWS will use multiple accounts to host separate parts of their services. This is seen as good practice as it reduces 'blast-radius', the opportunity for a deployed service to adversely affect other services in the same account. However, as this starts to be implemented, you will typically come across a situation where you will want to access data or services in other accounts. In this article, I'll walk through one method of accessing data held in a different AWS account