First of all get a surrender value from the endowment company.
If it's a unit linked policy, and you still want to go ahead - do so. No-one will buy it for more.
If it's not a unit linked policy there are companies who may buy it from you for more than the surrender value. If you google you should find some. Ask several.
They will keep up the payments and cash in on the terminal bonuses, if any, when it matures. Whether they will buy or not depends on their view of this
Take great care when you sell your endowment as you may find that it is worth alot less than you think. This is what happened to me, try talking to one of those companies that specialise in under performing endowments before you sell.
I sold mine some years ago and I am going through the processes of claiming some of the true value of the policy back. the down fall of this is that they take a a percentage of the ammount they get back for you, but the up side is that I will get something back which I would not have got on my own.
Contact the Association of Policy Market Makers.
Ttelephone: 020-7739 3949
Fax: 020-7613 2990.
It represents companies that buy second-hand policies for more than surrender value.