Hi...welcome to the Club
Superb colour on the Astra, fine looking car!
DVLA may be able to help with tracking the old Vauxhall ..... good luck with the search
Good to have you onboard!
put your vehicle details into this link for Halfords and it should show the applicable battery specifications
https://www.halfords.com/motoring/batteries/car-batteries/
Lamp is showing an Engine Management fault lamp
Best bet is to get a scanner to extract fault codes
To be fair, the Motronic Engine Management system used on the car is very simple and usually completely reliable
Glad you managed to get to the show Andy and also that it was lovely weather as well
Will have a look at the pictures soon, did you show your car there?
What gear are you in and what road speed are you doing when trying to get to boost?
Possibly too high gear and worth trying it by knocking it down a gear?
It may be the clutch components (cover/pressure plate) that is heavy.
Additionally, there may be corrosion build up on the splines which may it a bit heavier on the clutch depression but that would normally result in clutch dragging (slight delay when pulling away)
I believe the LED bulbs are at the end of their life it they are glowing dimly
Also, check connections for any high resistance, e.g. corrosion on terminals, etc
Maybe worth checking the replaced sensor connection is tight, correct, etc as not sure if the circuit is a series connection (meaning if one sensor is out the lot go out - like a christmas tree)
On the indicator stalk there is a bit you can twist/roll, this changes the display to the various different displays
Go into settings and select unit settings. Depending on the model of your car it's accessed by either pressing the set button or selecting settings on the screen
Maybe better to go for a reconditioned unit with a good warranty
The fluid in the existing box will tell a story of whether the clutch plates are worn out - smells of burnt toast and the filter should have trapped lots of debris. Which means the death knell for that gearbox.
Vauxhall gearboxes are renowned for being weak but still carry on until they finally go - which can be years, running with noisy gears, poor selection, etc
Check the large fuse / fuseable link for damage (e.g. cracks or burn marks)
Also, check the battery condition as this can drop to a low voltage when starting and this can flag fault codes