Kirsch Porter Help!!!

Please can someone help me find somewhere that sells Kirsch Porter and delivers to the UK without absolutely extortionate shipping??

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A quick bit of reading shows that many Kirsch Porters are radler/shandies. Which means that kirsch is blended into a porter after the beer is brewed. No reason you could not do the same. Get yourself a nice Taddy Porter and add kirsch little bit at a time until you reach the desired flavor blend.