(For a live blog on European stocks, type LIVE/ in an Eikon news window)
* FTSE 100, FTSE 250 flat
* Fevertree slumps after revenue warning
* Intu down after confirming talks over cash call
Jan 20 (Reuters) - UK shares were largely unchanged on Monday, with trading volumes thin due to a U.S. holiday, while premium tonic water maker Fevertree and mall operator Intu Properties tumbled among smaller stocks.
The FTSE 100 .FTSE and the FTSE 250 .FTMC were flat by 0806 GMT. However, oil heavyweights Shell RDSa.L and BP BP.L advanced as crude prices hit their highest in more than a week after two Libyan production bases began shutting down amid a military blockade. O/R
With many investors away due to U.S. markets being closed for the Martin Luther King Jr. holiday, sharp moves were scant.
Still, Fevertree FEVR.L sank 19% and was on track for its worst day ever after it warned its annual revenue growth would be below its expectations, hurt by subdued trading over Christmas. centre operator Intu INTUP.L slid 5% after it said it was targeting an equity raise by the end of February to tackle debt.