Posted: 21/04/2014 at 14:26
Lancashire Lass, sounds like a good mix and you can only try, we all experiment more so in todays financial climate. Bought compost will have reached a higher temperature in its making to kill off bugs and weed seeds, most of our compost bins do not get that hot so you can end up growing things you did not intend.
I have heard complaints about B&Q compost, spreading it on a plastic sheet and adding a little lime would probably take away the sour smell, give it a couple of days or so to weather then I use a bin with a lid to store it.
The way I do it is put my own compost in the base then add bought compost mixed with grit and gel, it works for me although you will still find yourself watering twice a day in summer, putting the whole basket in a dish of water will get it back if the compost dries out.
Hope this helps good luck. Frank.