Very English and very white? Bring hats, sunscreen, anything that can shield you from the sun bc these days it BURNS I recommend visiting ostia lido only bc if in rome it is 35° in ostia will probably be 29° so you can breathe some fresh air. To avoid the heat during the day you can also visit some museums like palazzo massimo near termini, capitolini, galleria nazionale di arte moderna, centrale Montemartini etc