Million,that piece of advice normally works (in this case it doesn't) but is redundant as it applies to a good percentage of the questions on here.Surely the purpose of this site is to help people out when a question is bugging them,not patronise them.
The song itself was composed for the series and is probably called Where The Heart Is.I thought it was by Paddy McAloon,of Prefab Sprout,but his entry on IMDb doesn't list it.However I am sure the first name of the composer is Patrick as I am sure I heard Pam Ferris talk about it in an interview years ago.