While I have no experience driving in London, I use my Gallardo as a daily driver in South Florida .. . I go over speed bumps with no problem, and we have traffic jams in south florida that should rival those in London I would think...I use neutral on the e-gear alot when caught in stop and go traffic jams, and consider this to be the only thing the car is not well set up to handle...the problem is the gallardo does not go slow --3 mph type slow, so in a 45 minute long traffic jam, with stop and go and a great deal of very slow driving, you have to protect the clutch--this means sitting still when other cars would already have crept forward, then gassing it and jerking forward a few car lengths, prior to hard braking. My mechanic told me NEVER to ride the clutch--it needs to be engaged quickly, which means you ALWAYS start fast--you never "ease into" first gear slowly like you might in a normal car. This is the only issue with bad trafic, other than if some jerk bangs in to you.

I have over 11,000 miles of S Fla driving since last Christmas, with plenty of traffic jams, and my clutch still feels like brand new.
Right now I am driving the Gallardo in the Smokey Mountains of North Carolina, which is more like driving it in the mountains of Italy ( south of Tropea, or perhaps in the Amalfi coast area.....narrow mountain roads, switchbacks, steep climbs, sometimes a bumpy road, and plenty of high speed sections!)

I would say go with the Gallardo, given all the comments you made about what you wanted.

As to storage of sports gear, I don't golf, so have not tried this--but am fairly certain you could bring clubs..a large bag might be problematic.
I have taken all my freediving gear, and even my scuba diving gear( minus the tanks), and had plenty of room. I can not find a bike rack to use for it, so if I want to mountain bike or road bike, I need to use my other car ( Honda s 2000 with bike rack :-) .. or use my wife's Ridgeline.

Hope this helps.