By Carla Mozee, MarketWatch

LONDON (MarketWatch) -- U.K. stocks fell Friday, with shares of Shire PLC pushed lower after the pharmaceutical maker was criticized over tax avoidance, but the benchmark FTSE 100 remained on track for a weekly gain.

The FTSE 100 lost 0.4% to 6,841.97, as consumer and industrial firms were under pressure. Shire shares were at the bottom of the index as they fell 1.7%. An influential committee of British lawmakers said accountancy firm PwC helped Shire engage in tax avoidance, via 10 billion pounds of intracompany loans the pharma made to its business in Luxembourg.

"Neither PwC nor Shire could demonstrate that the company's presence in Luxembourg was designed to do anything other than avoid tax," the parliamentary Public Accounts Committee said in a statement. "We note that Shire paid tax of only 0.0156% on its profits to the Luxembourg tax authority."

Other decliners included home builder Barratt Developments PLC and electronics retailer Dixons Carphone PLC , down 2.3% and 1.7%, respectively.

Among the advancers were Aberdeen Asset Management PLC and Royal Bank of Scotland PLC , gaining 1.8% and 0.9%, respectively.

The index is on track to rise 1.4% for the week, which would mark a second consecutive week of gains.

On the FTSE 250, shares of Poundland Group PLC surged 7.6%, topping the index after the discount retailer said it's reached a conditional agreement to purchase 99p Stores Ltd. for an enterprise value of 55 million pounds ($84.3 million).

Meanwhile, Tate & Lyle PLC shares slid 14% after the ingredients maker said it expects full-year profit to come in below its previous forecast. It said weak performance in its bulk-ingredients unit in the third quarter is likely to run through the fourth quarter.

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