Don't you mean endowment mortgage?
For many people, interest only mortgages are called 'endowment mortgages' or even 'pension mortgages', but strictly speaking these names describe an interest only mortgage plus the method by which it is repaid. In other words, an endowment mortgage is an interest only loan that is repaid by the proceeds of an endowment policy etc.
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Your home may be repossessed if you do not keep up repayments on your mortgage.