Directory Enquiries- any cheap versions recommended ?

[#1]

Recently moved to HomePhone.
My wife dialled 100 for dirctory enqs. (i.e.118500)  without me knowing, and it cost me 78p. for 1 min ! 
Can anyone recommend a reliable, cheaper number to use in future ?   

[#2]

This is free http://www.bt.com/index.jsp
You may need to use advance search to cut down the results

[#3]

the actual BT directory is free on Internet the free one 

[#4]

This from the Money Saving Expert site is well worth a read.

[#5]

If you are looking for a "local number" say , " fitness centre"  Margate (or where you live)  and you know the name, if you just google for it, you could find the phone number is also listed.... if you "google maps"  it, you will get the alternatives too !

EDIT....
And make sure you have this  http://www.saynoto0870.com/
in your Favourites/Bookmark list...... useful for alternative numbers not on high rates...
Surprising how many have "ordinary" phone numbers that you can call.....

[#6]

Thanks to everyone for the various  replies, all noted and logged, super ideas !