Smuggled ones usually have re-stamped dates. I bought Michelin Energy Saver (Made in Germany) in 195/65/R15 for my Altis. These costed me PKR 9,200 per tyre. Michelin Energy Saver is much better than the XM2 Energy. XM2 is British by origin.
As for Yokohama, usually AVS dB costs around PKR 8,500 and Advan dB costs around PKR 9,700.
In LHR, u can go to J. Rashid and Pak Punjab Tyres.