Welcome from Wales.
Your Morgan will find you. Spaniels also help select a car in one dealer too!
As for seats.....I had wooden spacers in mine. I removed the driver side ones but left the passenger ones in on orders from

it is a personal preference tweek.
You get that with Morgans. You see and hear about what people have done and find things you like.
Go to dealers for test drives and talk to them for advice.
Go to Hopmog meets and noggins.