FTSE 100 joins global rebound after turbulent week

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* FTSE 100 up 1.5 pct, FTSE 250 up 1.1 pct

* Consumer staples lead gains

* Primark owner ABF falls 2.5 pct after weak trading statement

By Helen Reid

LONDON, Dec (Shanghai: 600875.SS - news) 7 (Reuters) - Britain's top stock index rose on Friday after a tumultuous week during which global stocks sold off and investors in UK stocks fretted about a parliamentary vote on Brexit next Tuesday.

Britain's FTSE 100 rebounded from Thursday's plunge to gain 1.5 percent. Financials, consumer stocks and oil majors boosted the index.

Investors and analysts remained unconvinced the gains represented a change in sentiment, though.

"Are people going to put new cash to work convincingly now, thinking this is the low? I can't see there's any urgency to do that now really," said Ian Williams, analyst at Peel Hunt.

"It does look like a bounce from an extreme technical oversold level, but I don't think it means we're out of the woods yet by any means," he said.

Shares (Berlin: DI6.BE - news) in Associated British Foods (LSE: ABF.L - news) fell 2.4 percent after the Primark owner said trading at its budget fashion chain was challenging in November.

"The next three weeks will be critical, and there may be a chance to reverse the trend if the weather normalises," Credit Suisse analysts said.

Marks & Spencer (Frankfurt: 534418 - news) shares also underperformed the market, up just 0.6 percent, as traders said Primark's weaker performance reflected broader challenges for retail.

Shire (Xetra: S7E.DE - news) fell 1.7 percent, the second worst-performing FTSE 100 stock. Japan's Takeda Pharmaceutical, the company acquiring Shire, suffered a 5 percent slide in its shares overnight.

Multinationals British American Tobacco, Diageo (Euronext: DGE.NX - news) , Unilever (NYSE: UL - news) drove much of the FTSE 100 gains as the dollar recovered from Thursday's slide.

Mid-caps saw some big moves.

Intellectual-property investment firm IP Group (LSE: IPO.L - news) 's shares fell 7 percent after Jefferies cut its rating on the stock to "underperform" from "hold".

"Against our earlier hopes for second-tier portfolio companies to step up to diversify dependence on Oxford Nanopore, hopefuls have largely failed to deliver, the listed portfolio drags and the market remains largely uninterested - ominously with the next significant funding beginning to loom," Jefferies analysts said.

Shares in tour operator Thomas Cook (Frankfurt: A0MR3W - news) fell a further 3.5 percent, having suffered sharp falls this week.

Genus (Frankfurt: 762548 - news) fell 4.7 percent after the company announced a placing of 3 million new shares.

On their first day of trading, shares in retail investment platform AJ Bell surged 36 percent. The firm's IPO valued it at 651 million pounds.

(Reporting by Helen Reid, editing by Larry King)