Bramblina, this is quite a difficult one, if you feel you cannot afford it. Insurance is basically a safety net for your family. Fine if you never need to claim on it (yes, all those premiums go wasted), but if you do, you will thank your lucky stars because usually no amount of savings will compensate you for that kind of loss.
As other posters have suggested, go see a financial adviser to see which ones are important. This depends on whether your dh and/or yourself are in employment with benefits (death-in-service, long term disablity, private health insurance, pension).
Off the top of my head, based on pure affordibility alone, if you are a home owner, get buildings insurance at least (if your home burns down). This is fairly inexpensive. Contents insurance is more expensive and for if you are burgled.
If you own a car, motor insurance is compulsory.
Critical illness is very expensive and relatively limited in cover. Mortgage cover is a rip-off IMO. Better to get term life insurance to cover at least the mortgage for each of your and dh's life. So in the eventuality that one dies, the home is paid off. Term life insurance is fairly inexpensive and you can get a joint policy.
These are the basics, I feel. But check if your/dh's employer supplements this.