I bought a repair kit from Gowings years ago, similar to Gunna's but with tube patches, valve tools, chalk, rasp, etc etc.
I use it all the time to repair punctures. You'd think living in the 'burbs we wouldn't get many, but I (used to) get heaps. With a lot of building going on, the builder throws down the tail gate on his ute, half a dozen tech screws fall onto the road and that's all she wrote. The plugs are brilliant, and not hard to use. I have read that one should get the tyre patched internally, but I've not had one plug need any further attention, in 100,000km on a set of BGF ATs I had.
I don't have any tools, bar a tyre level, to change a tyre off a rim, though I'd get an R&R Beadbreaker in heartbeat.