Nigel Murray was among the GB medallists in Lisbon
The Great Britain boccia team have won three silver medals at the World Championships in Portugal.
Scotland's Stephen McGuire won two - one with brother Peter in their pairs event - and the other in the individual final in the same category.
Paralympian Nigel Murray was the runner-up in his individual final, losing 5-2 to China's Yan Zhiqiang.
Murray's five-strong BC1/2 team, who were gold medallists in Beijing, lost out in the quarter-finals to Thailand.
GB boccia performance manager Matt Hammond was pleased with the team's performance but warned that other nations were providing tough competition.
"As a team, GB were outstanding in these championships, leading the way for Europe with a medal haul of three silvers," said Hammond.
"The standard of the game globally has risen significantly with Korea setting the early pace for London 2012.
"However, these results show that the British team is competitive at world level across the classes and will act as a springboard for the GB squad over the next two years as we focus on preparing the players for London."