I'm interested in how ocean width affects merging of landmasses- while the UK is missing as a distinct landmass, there's a lot of blurred overlap in the UK/scan

I'm interested in how ocean width affects merging of landmasses- while the UK is missing as a distinct landmass, there's a lot of blurred overlap in the UK/scandinavia area - if some kind of averaging is used, the relatively close sea distances may be eliminated by people getting them in differing wrong locations. It also looks like something similar happened to Japan and India.