Well, I did a lot of research and I can assure you that my health insurance complies with what HO is asking.
The cheapest options that will get you that are: WPA Premier and April UK Inspire.
If you actually go with the traditional or big ones (Axa PPP, BUPA, etc) will cost you as much as what you are quoting (£100) but the middle size ones will do exactly the same thing. So for people who just want to get the CSI and don't claim (use it) then these two options are the cheapest ones available that will be enough for HO requirements.
The £30 has a 25% discount for the first year... there's cheaper options like WPA Basic but that won't be "comprehensive" so you need at least the Premier option.
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Well, if you are happy with it that's cool... However as in our case we signed for a twelve month contract...
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April does not have 12 months contract, you can cancel anytime you want. With WPA you can also cancel anytime, must make sure it's monthly payments and you haven't claim anything.