Greek uncertainty curbs European stock gains
* FTSEurofirst 300 index closes up 0.6 pct
* Athens bourse falls, hit by ongoing political uncertainty
* Upbeat economic news lifts Madrid and Lisbon markets
* FTSE up but pares gains as UK external deficit rises
By Sudip Kar-Gupta
LONDON, Dec 23 (Reuters) - A fall in Greek stocks kept a lid on gains in European equities on Tuesday, as the Athens bourse was hit by the prospect of early elections that could put Greece's rescue package at risk.
The pan-European FTSEurofirst 300 index closed up 0.6 percent at 1,374.80 points, with the index up 4.4 percent since the start of 2014.
The broader European equity landscape was helped by positive economic news from Spain and Portugal.
The Bank of Spain raised its economic forecast while Portugal's budget deficit shrank. Continuación...