I got that text too!
For those who may not have received it:
Tesla Update - You now have the option to equip a tow hitch to your Model Y order -providing up to 1,600 kilograms of towing capacity. The additional cost of Tow Hitch is £1,090. If you would like to update your order, please respond 'YES' within two days and you'll receive a confirmation email once complete.
We very much want a tow hitch, but I REALLY don't want to delay the order any further! I've replied, in case a human reads it.