Thanks xwordfan- I have an answer now - whether its the right one or not I have no idea!!! Its all very confusing!! I still haven't got 8 but I would appreciate any extra clues for : -
44. Bearing on average 51 tonnes,sent back out to complete the task.(6,4)
48. Maybe black Peter from Rotterdam lived at No. 742? [6,6,6)
77. Working with Mrs Black . (7)