Can anyone confirm if they pass MOT?

No guarantee they will on your car but mine did on a '54 X-Trail. They produced a good flat line across the top which wasn't too high which is what they look for. Check out some vids on Youtube and adjust your lights before the MoT if you need to. The difference these make to night driving is staggering and well worth the effort.

Is there a way to fit these upside down or is it foolproof? Should the notch in the bulb bit be at top or bottom

The is only one way they will fit in fool proof

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Philips Ultinon Pro9100 LED car headlight bulb (H4), +350%, 5.800K, set of 2

Product ID: 488448085

Details

Brand
PHILIPS
Brightness
350.0 lumen
Colour temperature
5800 Kelvin
Light source type
LED
Specific uses for product
Head light

⏳Up to 5,000 hours lifespan

💡+350% brightness boost

❄️5,800K crisp cool white light

Description

🚗 Brighten your drive, own the night!

COOL WHITE CLARITY - 5,800K color temperature delivers sharp, modern cool white beams that cut through darkness.
PLUG PLAY UPGRADE - Compact all-in-one design ensures effortless installation—no mechanic needed.
DRIVE WITH CONFIDENCE - Designed by Lumileds, trusted by professionals, for superior front lighting performance.
ILLUMINATE LIKE A PRO - Experience up to 350% brighter light for unmatched night visibility.
LONG LASTING PERFORMANCE - Engineered to shine for up to 5,000 hours, reducing replacements and hassle.

The Philips Ultinon Pro9100 H4 LED car headlight bulbs deliver a powerful +350% brightness increase with a crisp 5,800K cool white light. Built for longevity, these bulbs last up to 5,000 hours and feature a compact plug-and-play design for easy installation. Perfect for professionals and enthusiasts seeking enhanced night driving visibility and style.

Specifications

ASIN	B0BKSTZMC5
Auto Part Position	Front
Best Sellers Rank	242,920 in Automotive ( See Top 100 in Automotive ) 659 in Special Car Bulbs
Brand Name	PHILIPS
Brightness	350.0 lumen
Color Temperature	5800 Kelvin
Colour	5.800K
Customer Reviews	4.3 4.3 out of 5 stars (73)
Included Components	Set of 2 LED car bulbs H4
Item Type Name	Ultinon Pro9100 LED car headlight bulb (H4), +350%, 5.800K, set of 2
Light Output Maximum	350 Lumens
Light Source Type	LED
Manufacturer	Lumileds
Manufacturer Part Number	11342U91X2
Manufacturer Warranty Description	5 years
Model Number	1866394
Number of Items	2
Operating Life	5000 Hours
Package Quantity	1
Specific Uses For Product	Head light
Unit Count	2.0 count
Voltage	12 Volts
Wattage	18 watts

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