I don't know much about Macbooks, my last one was in 2009 and it broke after a few years so I've been wary ever since.
Apple MacBook Pro (15" Retina, Touch Bar, 2.8GHz Quad-core Intel Core i7, 16GB RAM, 256GB SSD) 2017
Apple MacBook Pro (15" Retina, Touch Bar, 2.2GHz 6-Core Intel Core i7, 16GB RAM, 256GB SSD) 2018
The first is refurbished, the second is new. £100 difference.
Apple MacBook Pro (15" Retina, Touch Bar, 2.8GHz Quad-core Intel Core i7, 16GB RAM, 256GB SSD) 2017
Apple MacBook Pro (15" Retina, Touch Bar, 2.2GHz 6-Core Intel Core i7, 16GB RAM, 256GB SSD) 2018
The first is refurbished, the second is new. £100 difference.