Hello, I am Keith, one of the experts on Just Answer, and pleased to be able to help you with your question.
The UK has no gifts tax regime so this 70K comes to you tax free. Just warn your bank of incoming funds and their source to preclude any money laundering inquiry a large sum might attract. A gift does not have to be declared on your self assessment although any interest earned from its deposit is liable to Income Tax (IT) in the normal way and you will have to note it on your return. If you put in say a SIPP or indeed any other private pension then watch out for the annual limit, currently 40K, but with a SIPP you can go back three years to mop up any unused contribution levels. You do not need to use such tax avoidance anyway as I have told you the receipt of this sum is outside the scope of UK taxation.
I do hope that I have set your mind at rest on this matter.
No, it is tax free because it is a gift. The same would apply to any gift world wide, tax free.
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I think you are concerned about the seven year rule for UK gifts which can spill into the donor's Inheritance Tax (IHT) over that period. This does not apply to an US resident citizen or their gifts.
Yes it is a good idea for the gift to be evidenced in writing just in case of inquiries.
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