Don't be optimistic in getting job in london, with out prior exp in uk.
here people wont consider your india exp and expect atleast some uk exp.
if you have min 6-12 months exp then you could easily get jobs in london.
many of my friends just come here on work permit ans searching for jobs since 6 months. but not succeed. best thing is to come here through a indian company and work for 6 months and then try. Now days london employers are ready to apply for workpermit once u clear the interview and having min 6 months exp in uk and total 5+ yrs exp.
All the best.