My researches even led me to believe that 0845 calls of up to one hour were now free at weekends for those on the weekend plan, rather than customers being charged hugely more. Furthermore, I had understood that from the 61st minute onwards weekend 0845 calls were charged at the lower rates of 1.96ppm (weekend daytime) or 0.49ppm (weekend evening), as against 3.92ppm (all weekend) for 01/02/03.

I had understood that in general 0845 calls of up to one hour were now free at the same times as 01/02/03, i.e. weekends, evenings and weekends or anytime according to the call plan, and were cheaper when charged: 1.96 vs. 3.92 weekday daytime, 0.49 vs. 1.47 weekday evenings.

... It still charges hugely more to call 0845 numbers than 01/02/03 numbers at the weekend for the millions of its customers who are on the Weekend Calls Plan.  01/02/03 calls up to an hour long are free at the weekend but 0845 calls are not on the BT Weekend Calls Plan and are charged by the minute.