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Can you edit and create a separate entry for each observation please. iSpot is not really designed to identify multiple things under one entry.
As David says, iSpot works best if you have one species per observation, so if you can click on Edit towards the top of the page and remove two of the photos we may be able to add an identification for the remaining one.
I think your caterpillar is Red-necked Footman, which is quite a scarce moth.
The hoverfly is probably in genus Platycheirus or Melanostoma - these are hard to confirm from photos.
And I can't help with the slug I'm afraid.
Entomologist and biological recorder
Lat/Lng: 50.1965, -5.1471
OS grid ref: SW754376