* FTSE 100 flat, FTSE 250 down .2%* Hochschild Mining Plc shares slump 8.7%* Primark-owner shares up 1.2% (Updates through)By Joice AlvesAug 19 (Reuters) – London’s FTSE 100 was largely unchanged in slender summer months trading on Wednesday, rarely reacting to a surprise rise in domestic inflation past thirty day period and the British government’s plan to ramp up COVID-19 screening.Well being minister Matt Hancock reported Britain is preparing to provide in inhabitants-vast mass tests for coronavirus to support control the pandemic, adding that the federal government is performing with London’s Heathrow Airport to shorten quarantine. commencing the session in negative territory, the London blue chip index flattened at 0919 GMT, with shares in British Airways-proprietor IAG jumping 3.2% to the top of the index.Shares of Primark-operator Connected British Meals received 1.2% as purchaser price inflation jumped previous thirty day period to its greatest rate because March, with clothing stores refraining from their usual summer season discounts just after reopening from lockdowns. inflation came in very a little bit increased than anticipated in July,” said James Smith, ING created marketplaces economist.”A a great deal less pronounced drop in outfits prices than we’d typically see at this time of yr appeared to be the major perpetrator.”Meanwhile, in the groceries area, Morrison shares obtained 1.1% following it mentioned its goods on Amazon (NASDAQ:) for same-working day delivery. Shares in on the internet grocer Ocado had been up 1.5%, though market chief Tesco ‘s shares had been down .5% on negative read through-throughout.Lower oil selling prices capped gains and dented trading in vitality stocks, with BP Plc and Royal Dutch Shell Plc remaining amid the most significant drags. O/R Persimmon shares dipped as the firm claimed the chief executive officer of bus business Countrywide Convey Team , Dean Finch, will take up the top position at the homebuilder before than envisaged.The mid-cap FTSE 250 was down .2%, with precious metals miner Hochschild Mining Plc slumping 8.7% as it posted a decreased revenue for the 1st fifty percent of the year.