Question : query to find days over 30 since event

Attached is a new database Completion matters

I want to build a query which discovers those records where the Date To Land Registry item is more than 30 days after the Date of Completion

I have forgotten the way to use criteria for this.
help please?
completion matters table

Answer : query to find days over 30 since event

Sorry, I thought completion should be after registry:
SELECT [dateToLandRegistry]-[dateOfCompletion] AS Expr1, [completion matters].[completion ID], [completion matters].clientName, [completion matters].completedBy, [completion matters].dateOfCompletion, [completion matters].dateToLandRegistry
FROM [completion matters]
WHERE ((([dateToLandRegistry]-[dateOfCompletion])>30));
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