Wednesday broker round-up:

AstraZeneca: Morgan Stanley lifts target price to 4,500p from 4,300p, reiterates underweight.BG Group: Canaccord Genuity improves target price to 1,300p from 1,016p and downgrades to hold.GlaxoSmithKline: Deutsche Bank raises target price to 1,600p from 1,300p and reiterates hold.Tate&Lyle: Numis downgrades to reduce with a target price of 563p.St.James Place: Panmure Gordon reiterates buy and takes target price to 1,125p from 1,057p.National Express Group: Nomura cuts to reduce and lowers target to 260p from 280p.Go-Ahead group: Nomura improves target to 2,950p from 2,550p and upgrades to buy.Icap: Credit Suisse upgrades to neutral with 550p target.Experian: Credit Suisse upgrades to outperform with a target of 1,300p.BHP Billiton: JP Morgan reiterates neutral and shaves target to 1,600p from 1,690p.Carnival: Morgan Stanley lifts target to 3,300p from 3,100p and reiterates equalweight.Rightmove: UBS takes target to 3,470p from 3,170p and reiterates buy. Astrazeneca Gooch & Housego Rightmove Tate & Lyle Experian Glaxosmithkline St James's Place