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* Investment platforms slip after UK regulator warns on charges

* Miners shine on higher metal prices

* U.S. inflation data on tap

* FTSE 100 up 0.6%, FTSE 250 adds 0.1%

Dec 12 (Reuters) - The UK's FTSE 100 started Tuesday on a positive note, led by miners amid higher metal prices and investor optimism fuelled by soft domestic wages data, with focus shifting to the U.S. inflation reading due later in the day.

The blue-chip FTSE 100 climbed 0.6% as of 0908 GMT, touching its highest level since Oct. 18, while the domestically-focussed FTSE 250 index added 0.1%.

Miners of both industrial and precious metals advanced 1.5% and 1.2%, respectively, buoyed by the rise in metal prices due to a weaker U.S. dollar.

Separately, London-listed shares of Rio Tinto advanced 2.1% after J.P. Morgan upgraded the global miner's rating to "overweight" from "neutral."

Meanwhile, official data showed British wage growth slowed more than expected in the three months to the end of October, but pay is probably still increasing too quickly to persuade the Bank of England to cut interest rates any time soon.

"The modest drop in the measure of pay-rolled employees for November will have been welcomed as a sign that things are still moving in the right direction, but the pace of slackening remains painfully slow," said Stuart Cole, head macro economist at Equiti Capital in London.

All eyes are now on the November U.S. consumer prices data, a day before the Federal Reserve is scheduled to announce its monetary policy decision. The Bank of England and the European Central Bank will also announce their respective decisions during the week, with all three expected to hold rates steady.

Bucking the trend, the investment banking and brokerage services sector dropped 0.6% following concerns raised by Britain's Financial Conduct Authority (FCA) regarding the levels of interest and fees charged by certain investment platforms.

Shares of telecom firm BT Group lost 3.4% after UK's Ofcom proposed a ban on inflation-linked mid-contract price rises. (Reporting by Shashwat Chauhan in Bengaluru; Editing by Sonia Cheema and Dhanya Ann Thoppil)