Power Query concatenation using &

Hi,
have a question regarding joing dates or number and text in power Q;

If I have a date column and then create two more so;

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and

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and then go to addcustomcolumn and join them

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But if I don't add these helper columns I seem to need to covert the year to text first;

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why? I can see that the DateYear does return a text value ( left side) , but if that's the case shouldn't it work within the concatenation?

Richard.

Yes, you're right just tried again, I don't know what I did but I did manage to join the two, Month Name and Year without converting to text,

Not sure what I did as I've deleted it in frustration to start again from scratch.

RD