kniki put this tip under Jams etc- but you may want to make a note in the book
I made the plum jam from the new Everyday cookbook and it turned out great.  I did add half a packet of Jam Setta just to be sure, as it was my first time with making jam.
I would suggest taking the pips out of the plums first, though.  I followed the instructions which said to take the pips out at the end, but they were so crushed up that even though I strained the jam through a colander, there are still tiny bits in there.  I will eat it myself (it's yum!!) but I won't give it to anyone else just in case they break a tooth.