Posted: 02/06/2015 at 06:31
Most pears need another pear tree from the right group in order to be properly pollinated - some (e.g. Conference and Concorde) are at least partially self-fertile and will produce a reasonable crop without a pollination partner (but an even better one with).
Your difficulty in providing a pollination partner will be knowing the variety of the pear tree you have in order to select a partner from the right group.
Info here http://www.orangepippintrees.co.uk/pollinationchecker.aspx
Remember that pears will not ripen to the eating stage on the tree - they need picking before that stage and storing - explanation here https://www.rhs.org.uk/advice/grow-your-own/fruit/pears
Hope that helps