The new Prime Minister was born on 12 May 1980, Southampton, birth time unknown.
With only 11 events I rectified his chart to 23.01.20 BST Asc 19Sag10'.
In this rectified chart the Moon at 0Tau23' is sextile Venus, trine Jupiter and in opposition to heliocentric Venus which is the ruler of MC and quite close to it in 10th house- all in very tight orbs.
The main primary directions in Topocentric for his elected as PM:
Jupiter 180 Moon 4'
Venus 90 Jupiter 5'
Venus 0 Jupiter 4'
Secondary directions:
Venus 180 Asc 3'
Moon 0 cusp 11 9'
Moon 0 cusp 11 4'
Transit Mercury conjunct MC
In the lunar return Jupiter on MC, Mercury on IC
In the converse lunar return Mercury on IC
Just one example for his defeat on 5 Sep 2022:
In the converse lunar return, Mercury in opposition to Pluto right on AsC- Desc axis, Mars and Saturn on MC.
Converse transit Neptune in exact opposition to converse transit Mars, both square Asc.

Thank you Isaac for working on the rectification.
Above are the PD chart and the aspects to the natal (Topocentric)
https://carta-natal.es/direcciones-primarias.php
Tip: Spanish website - United Kingdom is Reis Unidos
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Profected Year - Gemini
SR 2022 - Saturn on the ASC and Pluto on the MC is not an easy year. Reforms will not be popular.

However, he seems a better fit than Truss as the last JU/SA conjunction at 0 Aquarius falls right on his VE/JU midpoint (Ve ruling his 10th and Ju ruling his ASC) and he is 'confirmed' when the SU/VE/MO in Scorpio came to square this position.