Huge thanks to those who have helped me with this:

• Mike McLoughlin for some fancy JavaScript which will hopefully send you an email when you submit your form
• Stephen Hind for - as always - some great Sites advice
• Oleg Kostyukevich for adding info to the map
• Matt King who's been incredibly helpful and done some amazing stuff with Sheets!
• Oh yes, and of course a massive thank you to Google for organising this!

Note: this is the same as I used for the 2018 trip - but it's still as valid!