Have messaged them suggesting a tree surgeon. (My first thought too.) If there's enough people worried maybe they'll club together.
For anyone wanting to know what the ad says:
We hope somebody can help there is a cat stuck up a tree near us she has been up there since tuesday afternoon, the fire brigade has came out and said it to dangerous for them to go up because of the type of tree, the tree is about 60ft and the cat is at the top, cat protection and the rspca havent been any help (suprizingly) has anybody got any ideas? the cat is becoming weeker and weeker she is also pregnant, please if anybody has any ideas or think they can be of any help please get in touch, many thanks