Thomas Pink - LHR T3

Quick question - I have recently developed a love of Thomas Pink shirts and I remember seeing one at LHR T3 on my last trip through. Does anyone know the size of saving you get at the T3 store? Is it just the duty (~17.5%)? I have another trip to India coming and fancy a few new shirts [^]
Cheers,
Ongen
Cheers,
Ongen