- I'm writing to you to enquire whether you have a need for
- I'm writing to you to enquire about whether you have a need for
Which is proper?
Your first option is correct:
I'm writing to you to enquire whether you have a need for...
The second option is grammatically odd, but in any case would imply you were asking not about the need, but about everything around that need. I can't think of a correct usage here.
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