Don't take off 2 foot, they will just be ugly. Get rid of them if you can. But it does depend on their height.
And what about foxgloves? There are many, many poisonous plants, but vanishingly few cases of poisoning.
Don't cut it and take it indoors. It smells of cat w**.
Looks like cotoneaster to me.
Magnolias don't like to be pruned. They are apt to produce a lot of unproductive shoots.
Those look like the dreaded Spaniards!
Get picking on that Purple Sprouting or it will bolt too.
Sounds right to me. The new onion will use the onion set to grow. The onion set will rot away after it has been exhausted.
You can use newspaper. If it is windy enough to blow off the paper there will not be a frost.
If the birds didn't need them they will drop off naturally.