London shares , boosted by Wall Street , added to early gains with the blue chip FTSE 100 index hitting a new peak of 3921.8 before dropping back slightly .
<response> <location>London</location> shares , boosted by <location>Wall Street</location> , added to early gains with the blue chip <misc>FTSE 100</misc> index hitting a new peak of 3921.8 before dropping back slightly . </response>