Hi - and I am sure this is a question that interests many of our visitors. The best place for full impartial information on potentially making a compensation claim for a mis-sold endowment is on the Financial Services Athority website: www.fsa.gov.uk/consumer/pdfs/endowment_complaints.pdf
Basically, you have three years after you first realise there may be a problem with your policy to make a claim. That is usually taken to be when you received a 'red' notification from the Insurer advising of a potential shortfall. Your claim should be directed to the company that gave the advice in the first place. Although you no longer have your property, this should not affect your ability to claim if you feel you were mis-sold the policy originally.
Finally, there are plenty of firms that specialise in making claims on behalf of complainants - however, this is at a price as they will take a share of any compensation agreed.
Hope this is of some help.
Louise