Across
Plant, during historical period, run inside spy organisation (9)
See 20
Source of news heard in 1045 and 1115, for instance (5)
See 26
They're out every year, you said, breaking records (7)
Opening of games at Scottish town that got off to flying start in 1930 (7)
Noted runners from previous era hurrying back (5)
In 2001 he computed a bit less than 45 minutes? (3)
10a
Agreement commemorated in 2015 revised as act (anagram) (5,5)
Lecherous racist misbehaving around end of century (7)
From 2020, produces scores in sections over short time (7)
Fun starting in 1913 irritated a lot left out (9)
12a
Dispersed in mass burial in 1666 (5,9)
MP in 1983, initially, he was recalled for 1984 (5)
Eve of historic event in 1916, for which date's varying with year (6,3)
Down
Historical tax for one joining union in 1707 (4)
Call number set up, like a momentous step taken in 1969? (3-3)
France's extremely dated monarch, unwelcome visitor (10)
Prepares for 2027 and 2029, for example (6)
16th-century music distracted capital over half a century (8)
Article penned by second-century bishop, one undermining union (4)
Military exercises that started to link two countries in 1988 (8)
Parts of every year produce confusion, so to speak (4)
Since 1882, it marks success in tests for trees (5)
Properties split among people in 1117 (10)
Takes off a Romantic author (1795-1821) (5)
Like some numbers, within moderation always (8)
Male, having no heart about middle of 60s, was intimidating (8)
Like hundreds of dates accepted by male singer, American tough guy (6)
Preserve commercial area in country since 1867 (6)
Hint, having book set in 1728, say (4)
Small rescue vessel, in 1945, liberated part of the British Isles (4)
By the sound of it, a Channel Island providing oversea refuge in 1746 (4)
Type letters or click words in the clue