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I am Pete and I'll be happy to assist you today
If they were the last person to call then you can dial 1471 to find their number if you subscribe to Caller ID through your provider (e.g. BT, Sky)
If they were not the last person then unfortunately there is no way to find the number, unless you get someone else to listen to the recording and see if they can pick it up more clearly.
You are very welcome :)
Thank you very much :)