By Devik Jain (Reuters) -London’s FTSE 100 rose on Friday and marked its fourth consecutive weekly gains with consumer staples and miners leading advances, while sports good retailer Frasers jumped after unveiling a new share buyback plan. The blue-chip FTSE 100 closed 0.3% higher, with Reckitt Benckiser Group climbing 3.1% after Barclays raised its price target on the Lysol cleaning products maker’s stock. Other consumer staples including Unilever and Diageo were among the top gainers, benefiting from a weaker pound. “I don’t think that the actual rally in equity prices is sustainable. But I …