Either written in or set in?
Open to childhood favourites as well 
I've been taking great comfort in 'simpler-times' fiction recently and have loved the following:
The House in Norham Gardens (Penelope Lively)
Black Swan Green (David Mitchell)
A Traveller in Time (Allison Uttley) although think this is set in the 1930s.
I love how much comfort these books bring me during these monotonous weeks and love to escape to the past.
Any recommendations or old favourites? Even willing to stretch to the 90s 