We're headed to Paris/London next Spring. Fly to Paris (5 nights), then Eurostar to London, 7 nights in London and 2 additional nights spent somewhere in the countryside (we've settled on Somerset and/or Wales, and we can subtract a London night and add it to our countryside visit if we want; there is that flexibility), then fly home from LHR. Plane tickets purchased, no changes. My questions are, does anyone have suggestions as to whether we should do London first or the countryside first (or does it matter?) From London, where is the best place to secure a car hire for our countryside excursion (LHR)? My first time visiting the UK.