If you are going to come to the UK from the Netherlands get Netherlands EHIC cards so that saves you from buying private health insurance in the UK. In case you aren't working that's your CSI as periods as self-sufficient.
Also, separate from immigration rules, the NHS has it's own entitlement rules, so you want to make sure you and your spouse will be entitled to health care when you return to the UK.
Maybe this thread is of interest too:
Poster: I am Dual national Irish/UK citizen and we have moved back from Spain
86ti
Guru responded: Have you applied as an Irish national or a returning UK citizen? In the latter case you should not be required to exercise treaty rights as per the Eind ruling.
Find that discussion about Eind here:
http://www.immigrationboards.com/viewtopic.php?t=80142
Rolfus: " I raised this with UKBA in a FOI request. They made a very helpful and courteous reply.
In essence, they say returning British Citizens are covered by regulation 9 of the EEA immigration Regulations 2006, and there is nothing within reg 9 that requires a British (sic) national to continue to be economically active on return to UK. The regs are therefore compliant with Eind...
Of course the UKBA also deny that 'other family members' of British nationals have the right to facilitation . But as you are married this will not be an issue."
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"Can my family members work in the UK?
A family member of an EEA national who intends to travel with them or join them in the UK can work without a work permit. Family members are generally not required to register under the Worker Registration Scheme or comply with the special requirements for Bulgarian and Romanian workers. The EEA national must be a 'qualified person' in the UK."
For the first 90 days the Qualified person bit is assumed for all EEA nationals; nobody has to prove it. After 90 days the EEA national can be required to prove they are qualified persons, but in your case, see the Eind case above.