I mentioned these Mulleins in an entry last month [In praise of neglected areas, 11th. June]. At that point the first flowers were forming and I identified them as Verbascum thapsus which I think is correct. Generally V. thapsus throws up a single flower spike but occasionally produces multiple side spikes as is the case here. Then again Verbascum bombyciferum is sometimes grown in gardens and is characterised by the 'candelabra' effect but the leaves are more silvery and silkier than the ones here so I'm inclined to stick with V. thapsus. I'll have a closer look next time I'm passing.