If you want to fly you need a night rating (discussed previously) and an IMC rating.
Notice
need.
I bet the reason more people never fly after their PPL than do, is probably down to the fact that nobody explained these simple facts to them.
Also let me say, the IMC rating is not a get-you-out-of-trouble rating. That would be a GYOOT Rating. It allows you to plan an entire journey IFR as long as you weren't planning to finish up at Heathrow. But you weren't so that doesn't matter.
You need an IMC rating because Great Britain is an IMC country.
Why other similar peoples do not have IMCs I don't know. Maybe we are simply superior.