Creating mental wealth: The importance of finding a job you love doing

Next month I've been invited to talk at The Festival of Marketing on the Realising Your Potential stage. It's my first speaking gig since leaving Asda earlier in the year.
In the past I've been booked to talk about social media. Giving insight into how a supermarket manages Facebook or builds an audience on YouTube.
However, this time they wanted me to talk about mental health.
They'd apparently spotted something I'd written on here (someone occasionally reads my mutterings it would appear). In