Radio questions

It has been a busy radio week for me - Gardening Plus (the new name for Down to Earth, which is now three hours long) on BBC Essex and the Thursday phone-in and Dougan Does Gardening on BBC Radio Cambridgeshire.
Along with the usual "How do I kill this or that bug, disease or weed?" (rose blackspot is still a major concern for gardeners, even at this time of year) and "Why is this plant dying?", I've had some questions that may give some credence to changing climate.
Listeners have asked about looking after outdoor mimosas, lemons, olives, palms and even prickly pears - and this is the UK! The latter question came from a listener in Cambridge who had even managed to eat a few of her own prickly pears from a plant she had brought back from the Canary Islands earlier in the year. This was followed by a listener in London, who originally comes from South Africa, pointing out how they're basically a weed in that country because they propagate themselves so easily; chance would be a fine thing!
And, of course, there are always those willing to admit to the biggest of faux pas!; planting a monkey puzzle tree right outside the house in the front garden, planting a willow right next to a drain and someone even admitted to planting and growing pampas grass - the shame of it!!!