using System;

using System.Linq;

using System.Text.RegularExpressions;

using System.Xml.XPath;

using System.Xml;

using System.Xml.Linq;

public class Program

{

    public static void Main()

    {

        XDocument X = XDocument.Load("https://weather-broker-cdn.api.bbci.co.uk/en/observation/rss/2647553");

        var test = X.XPathSelectElement("//item/title").Value;

        Console.WriteLine(Regex.Match(test, @"GMT: (.+?),").Groups[1].Value);

        var weather = X.Element("rss").Element("channel").Element("item").Element("title").Value;

        Console.WriteLine(Regex.Match(weather, @"GMT: (.+?),").Groups[1].Value);

    }

}