UK Racing - Commentary by telephone

Backed a few horses today in Kempton.
Unfortunately , this racecourse was not on the TV .

Could anyone tell me the cheapest number to ring for commentary .

I did ring a number from today's paper , but its cost something like 2.50 a minute !

You'd be doing well to find a straight audio coverage from dialing a number however most if not all online bookies offer streaming audio commentary on all UK races. find the solution from there.