LONDON, Aug. 3 (Bloomberg): UK stocks climbed as UBS AG advised buying Petrofac Ltd. and as Intertek Group Plc and Barclays Plc reported a rise in profit.

Petrofac, a UK oil explorer, soared 7.9 per cent as UBS raised its recommendation on the shares to "buy" from "neutral." Intertek, the world's biggest tester of consumer goods, added 3.4 per cent and Barclays Plc gained 2.8 per cent as first-half earnings rose from a year earlier.

The benchmark FTSE 100 Index added 20.32, or 0.4 per cent, to 4,628.68 as of 8:41 a.m. in London. The FTSE All-Share Index gained 0.5 per cent and Ireland's ISEQ Index advanced 1.1 per cent.

Petrofac soared 7.9 per cent to 810 pence. UBS raised its price estimate 64 per cent to 1,000 pence, saying "the stock is one of cheapest in the sector" and that contracts awarded "demonstrate medium-term growth potential," according to a note to clients today.