Our last-but-one house was a Georgian end of terrace thatched. It was larger than the one you're considering @mumarooni and had a third of an acre garden (the reason we bought it - I really didn't want a thatch!). It had been re-thatched about four years before we bought it, we were there 3.5 years and it's now more than eight years since we sold. Looking at streetview I think the ridge needs doing.
It wasn't listed though which made things easier when we wanted to extend, although we restored it sympathetically putting in timber DG sash windows for example.
Whilst living there we had a chimney fire which was scary, plus some idiot lit a fire in the skip we had on our drive! Fortunately no serious damage occurred. Insurance was fairly high, but we found a specialist thatched house insurer after NFU - who the previous owners had used - refused to continue insuring the property.
Our house was on the A30 in Wiltshire (close to the Dorset border) and traffic noise was awful even after having the DG fitted...plus it had acoustic glass which made very little difference. Although we had a deep pavement (no front garden) and a lay by between us and the road, the house - which was three storeys high with tall ceilings for a 'cottage' - regularly shook when heavy traffic rumbled past.
We had no trouble selling back in late 2014 (we accepted an offer within five weeks and the sale progressed very quickly) and had no issues with our buyers who were getting a mortgage (we'd been cash buyers). No survey problems either.
But....despite loving the character, I definitely wouldn't want another thatch as I spent my whole time there worrying about fires...and if it was listed as well, plus on a main road I'd be running a mile.