UK Stocks-Factors to watch on March 28

March 28 (Reuters) - Britain's FTSE 100 index is seen opening up 24 points on Tuesday, according to financial bookmakers. * TESCO: Two of Tesco Plc's biggest shareholders have called on the supermarket group to withdraw its 3.7 billion-pound ($4.7 billion) agreed offer for wholesaler Booker Group Plc, potentially casting doubt on the deal's progress. * LLOYDS OF LONDON: Lloyds of London, the world's largest speciality insurance market, will this week pick Brussels or Luxembourg