Posted: 25/01/2016 at 14:59
Good information from Nutcutlet (as usual)
The brambles and rose bushes are probably the result of birds having deposited the seeds in their droppings - they germinate and take root very easily
The clumps of large-ish leaves - are they slightly furry, or are they slightly bristly?
If they're slightly furry they may well be foxgloves, which will flower in the coming summer and they'll look lovely and be good for bees.
However, if they're slightly bristly they could be one of the borage family, possibly Green Alkanet which, although an interesting plant, can spread like made and be a bit of thug.