Contingency planning for travelling to Spain after 29 March

Useful article in today's Sunday Times on things to be aware of/ be prepared for in terms of travelling after March 29th if there's no deal. Main issues for travellers to Spain ( talking non resident visitors here, not residents' issues) seem to be in relation to: driving licences ( may need an IDP to hire a car), pet travel ( current pet passports invalid), EHIC won't be valid, so travel insurance essential and make sure you have at least 6 months to run on your passport. Roaming Phone charges might be OK for the time being( depends on the phone company) and noone seems sure about immediate impact on flights, they might be OK.
https://www.thetimes.co.uk/article/brex ... 7e740d956c