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There is of course a major difference between 'invasive' and 'non-native' - invasive just means that the species is spreading out, so natives are entirely capable of being invasive - look at bracken and birch on heathland, for example. Most non-natives are a long way from 'invasive' - very few non-native species become established, and very few of those go on to become invasive, especially in the wider countryside - just think how many alien plant species are in gardens, and how few go feral. The rabbit has pretty much stopped its expansion and so should no longer be considered invasive. The botanists have a system where if a species has been present since c.1500 it's an archaophyte and is accorded semi-native status.

Personally, I used to work on the Adonis and Chalkhill Blues - neither species would survive without rabbits, and both were almost made extinct by the Myxomatosis outbreaks in the 1960s,

Not only do few people eat Rabbit now but many of those sold in the shops are actually imported from China !! This is a ridiculous waste of food miles and they taste like cotton wool , nothing like as good as a wild Rabbit or Grey Squirrel. I will try almost anything and regularly am given Rabbits by friends who shoot and sometimes have Hare or Muntjac that have been killed on the road, although would never wish to harm a live Hare. Many years ago when working at a Bird Observatory even tried Mute Swan as a result of a ringed bird hitting a cable and being brought dead to the Obs.

Certainly in terms of fish the introduction of Pike into the Scottish Highlands has had an impact in what are already low biomass environments, and certainly impacts the traditional role of the ferox trout. But we have Zander and Danube Catfish spreading through the Engish systems.

One of the most dramatic examples I have observed personnally is impact of Rhododendron, I believe it still has no natural predation in the UK and displaces other plants that would have supported insect life. A river I have visited in the highlands for many years was choked along its banks back in the early 90s and the trout population was very sparse and very small in size. In the second half of the 90s the Rhododendron was cleared, this resulted in the following:

A really quite dramatic increase in the brown trout population, and their size increase was even more dramatic, watching a significant hatch of insects, never seen before, is really quite delightful, and the activity from the trout in response also good to watch.

The now opened up banks also supports very pleasant walks for the public where they can see dippers, the odd salmon jump in addition to traditional bird life and the rising trout.

Access is now possible for canoeists and rafters bringing yet more income to the local area.

However when I was breeding Indian Moonmoths back in the 70s, living in Cornwall at the time, ready supplies of the food plant was a plus rather than having to make expensive purchases from suppliers, especially when you are on a pocket money budget.

Yep, still virtuallyno natural biocontrol of Rhodi - there are a few psyllids, etc, which will eat it, but they're not going to roll back the invasion! It's also surprisingly difficult to kill by hand - it regenerates quickly from untreated stumps and has waxy leaves which are very difficulto spray effectively - the treatment just washes off without penetrating

When I used to do work with the BTCV we used to clear Rhodedendron and would cut it at ground level and then immediately paint the cut ends with Glyphosate or Ammonium Sulphamate which are translocated herbicides which break down rapidly on the soil so are not persistent in the environment. I dont know if the latter is still available. I have heard of herbicide being mixed with diesel so as to penetrate the waxy leaves but this is environmentally undesirable. The cut material should be gathered and burnt not shredded as the plant contains phytotoxins that supress other plant growth.