Probe launched into Aviva's PS3.7bn takeover of Direct Line / Probe into Aviva's PS3.7bn deal for Direct Line launched by competition watchdog / European shares close slightly higher ahead of Christmas shutdown; Aviva to buy Direct Line in $4.6 billion deal / Aviva Reaches Preliminary Deal With Direct Line on Takeover / Aviva raises offer to buy Direct Line / Why Direct Line Should Accept Aviva's Offer / Direct Line Shares Surge 40% as it Rejects Aviva Offer / Europe stocks close higher; Direct Line soars 41% after rejecting Aviva bid / Direct Line shares surge 37% after insurer rejects Aviva bid / Direct Line needs a better plan to see off Ageas