I came close to completing this puzzle unaided but was forced to open my Tool Chest to solve the final four or five clues. It turned out to be mainly a few British expressions and geographical references that I needed help with. However, I felt somewhat consoled on reading the comments on Big Dave's site to find that even some of those from Southern England seemed to have trouble with Northern English geography.
Some possibly unfamiliar abbreviations, people, places, words and expressions used in today's puzzle
Bury - a town in Greater Manchester, England
D2 - abbreviation 2 IVR (International Vehicle Registration code): Deutschland (German), Germany
Charles Lamb - English essayist
opener - noun 2 a person or thing that opens or begins, for example the first goal in a match or a cricketer who opens the batting
Sir Karl Popper - British philosopher
(Corps of) Royal Engineers - (abbreviation RE) a corps of the British Army
ripping - adjective Brit. informal, dated excellent
side - noun  Brit. informal boastful or pretentious manner or attitude (Note: although explicit numbering vanishes after 9, this is the fifteenth definition listed for side as a noun)
trews - plural noun
Venus de Milo - ancient Greek statue on display in the Louvre Museum in Paris - especially renowned for its missing arms
Gazza's review of today's puzzle may be found at Big Dave's Crossword Blog [DT 26109].
Commentary on Today's Puzzle
28a Dispute's terrible - this examiner makes an appearance (6)
Keep in mind that British setters do not necessarily adhere to the American convention that requires a definition to be either the initial or final element of the clue.
29a Side on journey given somewhere to land (8)
I have to admit that I had no idea why "side" might mean AIRS until I read Gazza's review.
10d Horticultarists must get across lake? They sound angry (8)
I hadn't noticed the spelling mistake in the clue, so when Gazza mentioned it in his review I thought maybe it had been corrected when the puzzle was syndicated. However, that is not the case - the National Post has dutifully reproduced the clue exactly as it appeared in The Daily Telegraph.
19d Person providing the property, he having departed? (7)
This clue can be read in two ways. In one reading, it is a cryptic definition of a person who has died bequeathing property in his will. In the other reading, we see "the property" being THE ESTATE with "HE having departed" instructing us to delete the letters HE from this to get TESTATE.
Signing off for today - Falcon