my very old slow cooker recently died. it used to cook a meat stew in 8 to 10 hours. I have bought 2 new 'slow' cookers ( a morphy richards and a russell hobbs) and returned both to the shops for a refund as they both did not seem to simmer - they both cooked a meat stew in 4 hours, which is no good if i am going out for the day. Can anyone recommend a slow cooker that does cook slowly? i did turn the dial to low but the stew seemed to boil rather than simmer iyswim.