Accenteted Vowels on UK Keyboard Layout

I bought a refurbished HP ProBook 640 G1 with UK keyboard layout, which doesn't have the accented vowels; through some searches, I found that to insert vowels with acute accent I must press "ALT Gr" + vowel, and to insert a vowel with grave accent I must press the accent key (I think it's the first top left key) + vowel; about the acute accent, for me it works, but not for the grave accent.
Someone can help me?

 

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It was an idea that was considered, but in the end we preferred the stickers.