Probably just this price today - matching Currys one day offer for the same price.
I was looking at this, but ended up buying a Sony HX60 from argos/ebay for £116 on saturday
If you want a very small camera with image quality a good step above a smartphone, you will want at least a 1" sensor, which costs more than a smaller sensor... though your TZ70 will be better if you want the longer zoom in a small package (and still good image quality in bright places). An SLR would only be an option at this price if you were not concerned with size.
Not really. The market for 1 inch enthusiast cameras is 300-500. It's a competing camera. Not saying its better or worse, but it's not apples and oranges
RX100 m4 is 499£ currently, so quite different basket