The blue-chip index was flat, with banks including HSBC Holdings, Prudential Plc and Standard Chartered being the biggest drag.
Miners including Anglo American Plc, Glencore Plc and Rio Tinto fell between 0.2% and 0.6%.
The domestically focussed mid-cap FTSE 250 index was also flat.
Retail sales surged by 9.2% in April, when non-essential shops reopened after months of closure due to COVID-19 restrictions, their biggest jump since a previous reopening in June, official data showed.
Britain’s biggest seller of building materials, Travis Perkins, rose 1.7% after selling its plumbing and heating business to an affiliate of investment firm H.I.G. Capital for 325 million pounds ($461 million).
Card Factory slid 7.2% after reporting a marginal drop in like-for-like store sales, compared with 2019, after the UK began reopening stores and eased restrictions in April. Reporting by Shivani Kumaresan in Bengaluru; Editing by Subhranshu Sahu