If it is coming from below the graft union, then what you have is a sucker and it will produce the kind of pears which the rootstock does. These are usually pretty poor, small and hard.
If you want to try grafting a piece of the Conference pear on to it, then about now is as good a time as any to remove it with roots and pot it up. Grow on and graft in early Spring.
The sucker needs removing in any case.

Thank you for that I shall pass your advice on to my husband, you sound very knowledgeable, thank you again