For that trip (Southampton > Dover > Dunkirk > Den Haag > Hoek van Holland > Harwich > Sunny Milton Keynes) I used airbnb for the UK trip out, a VodF in Belgium, then a warmshowers and another VodF in the Netherlands. On the return UK leg I stayed at the house of a person off the internet, and then two more warmshowers hosts.
I had a couple of failed attempts at booking VodF places, and the well-seasoned Dutch warmshowers hosts ripping the piss out of me for booking with them a month in advance
The Belgian VodF place was a self-contained basement set-up in the house of a couple of architects. She cooked a lovely meal for me and chatted for a while, but also had well defined boundaries for space and time.
The one in Burgh Haamstede was basically a commercial BnB place, so other than checking in I didn't really have any contact with the proprietors.
For my trip last year I opted for Stichting Natuurkampeerterreinen and being more independent with timings and food. A strategic warmshowers when I overnighted in a big city.
VodF felt like good value, and not too distanced a way to engage with a new country. Ditto for warmshowers.
Natuurkampeerterreinen usually involved long chats with the owners too.