For those who wanted the slides, they are now available online here. They've got a lot of extra reference information that I didn't have time to pack into the talk. Don't eat them all at once.
The conference itself was full of very interesting stuff and, as ever, a lot of the most interesting learning happens outside of the talks themselves. The organisers did a great job.
I will be presenting an extended version of this talk (and speaking on other topics too) at the ACCU Conference in Oxford this April.