The calls to 0844200 numbers is a flat rate of 0.49p per minute daytime evening and weekend. These calls are subject to a 9.05p connection fee.
The 0844462 are again flat rate for daytime evening and weekend calls at 1.96p per minute, again subject to the 9.05p connection charge. The easiest method to use this document, as it is quite extensive, is to search for the first digits of the number you are looking for usuing the Ctrl+F function. I believe the 0844 entries being around page 35.