The 18-pounder link in the lead goes to a WWI gun, do you mean 18-pounder long gun?
Yes, oops!
"leaving more space than was often found to operate them in." - I've read this three times and I'm not entirely sure what this is trying to indicate - can it be rephrased for clarify?
Rewritten
" The ships would in later years be classified as 42-gun frigates." - was this a reclassification on paper, a change in armament, or both
Just the navy deciding to count more of the guns that were already there
"By 1800 the majority of British frigates were of a size with the ships of other nations" - is this missing a word?
No, but clarified
The lead directly states that the 1808 order was an accident, but this is relegated to a footnote in the main body. If it's significant enough to warrant inclusion in the lead, I would say it should probably be in the main text of the body as well
Done
"nd their crew complement was set slightly lower than the original iteration of the class; at 260," - I thought that was what the original iterations of the class had for the crew, as that was the original figure and the 270 was with later adjustments
The later adjustment was a year before the first ship of the class was even launched, no ship of the original iteration actually went to sea with that number (on paper!)