You must have visited a small B&M shop for it to give you that impression. The big one we go to has a garden center, aisles for DIY stuff (tools, paint, wallpaper, car stuff etc). Aisles for furniture (indoors/outdoors), toys, suitcases, seasonal stuff, all sorts of house furnishings, and then various food and drink.
I'd say out of all of them B&M is the closest to what Wilkos once was. Although they've done it better which is why it's killed off the competition.
Home bargains and poundland are typically smaller and probably have more focused product lines.
The range is like a bigger home bargains - I don't think they sell food, but do have all sorts of home furnishings and appliances. They also have a big pet section - toys, food, bedding etc.