LONDON -- The San Francisco 49ers are healthy going into Sunday's game against the Jacksonville Jaguars at Wembley Stadium.The four players who did not practice Wednesday -- defensive linemen Justin Smith (shoulder), Ray McDonald (biceps), Glenn Dorsey (hamstring) and receiver Jon Baldwin (illness) -- all worked on a limited basis Thursday. Barring setbacks they should all be ready to play Sunday.Defensive coordinator Vic Fangio said Smith may not practice every day for the season of the season.