It makes sense to take small and possibly even bigger white goods (most rental houses come with nothing, so you will need washing machine/dishwasher/fridge/freezer/hob/dryer basically everything). I would not use adapter plugs - they are not made for long term use.
I would take a few UK extension leads and replace the UK plug at the end of the lead with a continental plug (Dutch DIY stores like HUBO, GAMMA, PRAXIS etc or ironmongers) sell them. For stuff you use a lot, I would cut off the UK plug and replace with a continental plug. Voltage is not a problem.
In this way, you can also take your lights/radio/digital TV and use them in the Netherlands.
Personally I would not take a UK car, more likely to have an accident as you don't have such good vision with steering wheel on the wrong side, also more difficult to get components and insurance will be more expensive as it is more likely you will have an accident.
If you take UK beds and was considering new mattresses - then buy these in the UK before you leave as Dutch bed sizes and mattress sizes are different (you can get UK sizes but at a premium as they have to be specially made).
Books are very expensive in the Netherlands and English books even more expensive, so worth stocking up on children's books.
If your furniture is in decent condition then I would take it (get a number of removal quotes and you will find they vary wildly). Furniture in the Netherlands can be excellent quality but it is eye watering expensive. Basically, it is a very expensive country compared with the UK.