Whistler - the preamble says some cells contain multiple letters. That's how you get clues totalling 19 letters into 12 cells.
Thought this was fairly straight forward but great. And very welcome after only finally finishing off the numerical today. Had to look up the two lesser known members of the group - there was no way I was figuring out those anagrams.
Clues all solid and very neat how the objects all interlink with each other.
Only loose end for me is parsing the wordplay for 7d (I) - can't see the significance of the rescue vehicle. Ta