LONDON -- Despite Wednesday's decision by the U.S. Federal Reserve to maintain its tightening bias, London traders decided to take a sanguine approach Thursday.

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After a very quiet start, the main market pushed higher, and as midday approached the

FTSE 100

was up 47.3 points to 6479.60. Meanwhile, the

Techmark 100

struggled to make headway in either direction and was down 12.21 points to 3182.16.

Generally, it was undeniably a quiet day, so some traders started to focus on

MSCI's

quarterly structural changes to their indices due out Thursday night. They are used by many fund managers to help arrange their portfolios and measure their performance.

Some are speculating that tonight's alterations may have an adverse impact on U.K. telecommunications and health care stocks, as their weighting will be reduced to make way for under represented Spanish telcos and Dutch and Italian pharmaceuticals.

But others point out that if MSCI announces a move toward free-float weighting, which many believe it will do in the near future, U.K. telcos will definitely benefit. This is because the weighting of European incumbents, such as

Deutsche Telekom

(DT) - Get Report

and

France Telecom

(FTE)

, will be reduced as the German and French governments still hold large stakes in the companies.

In any event, the FTSE 100's two heavyweights were relatively flat.

British Telecom

(BTY)

relinquished earlier modest gains to stand 1p lower at 676 ($9.65) and

Vodafone

(VOD) - Get Report

stood 2.75p higher at 266.25 by midday.

Encouragingly,

Cable & Wireless

(CWP)

built on Wednesday's gains, rising 32p to stand at 919. In contrast, alternative

Colt Telecom

(COLT)

slid into negative territory, down 35p to

17.60.

Pharmaceuticals were mixed.

AstraZeneca

(AZN) - Get Report

recovered from its

Nexium

-induced hangover to stand 44p higher at

32.29. Elsewhere,

Glaxo Wellcome

(GLX)

added 3p to

20.32, while future partner

SmithKline Beecham

(SBH) - Get Report

came off by 3.5p to stand at 920.

Most Europe's other major stock markets were lower Thursday, as the

European Central Bank

kept its main interest rate unchanged at 4.75%. The

CAC-40

in Paris was off 64.6 at 6237.2 and the

Xetra Dax

in Frankfurt was down 95.6 to 6865.5. The

Neuer Markt's

tech-heavy

Nemax 50

index was 152.8 lower at 3796.2.

Amid continuing fear about its U.S. operations,

DaimlerChrysler

(DCX)

weighed heavily on the Dax. The carmaker's shares fell 1.79 euros to 50.65 ($43.42).

Volkswagen

(VLKAY)

dipped 0.90 euro to 57.65.

Drug company

Bayer

(BAYZY)

dropped 1.49 euros to 49.76, after the company reported disappointing third-quarter earnings. Rival

BASF

fell 0.56 euro to 43.54.

Techs and telcos were also lower, as

STMicroelectronics

(STM) - Get Report

fell 1.45 euros to 52.55,

SAP

(SAP) - Get Report

dropped 12.31 euros to 200.89 and France Telecom was down 3.40 euros to 112.90.