English food tends to be better at home than at restaurants. Also, it tends to mostly be undefined brown lumps but it does have flavor and there are some spices. (mostly mustard)

The exception is "Chinese takeaway", which is actually as bad as the stereotype.

Youll struggle to get the rda from diet alone unless you eat daily fish.

https://ods.od.nih.gov/factsheets/VitaminD-HealthProfessiona...

As a conversational point, I do recall reading an article sometime ago about people moving to the UK from sunnier places, and then suffering from Vitamin D deficiency!