The period 2009-10 is the second consecutive year that the number of investigations into suspected Nazis has risen--there were 608 in 2007-08.
According to Efraim Zuroff, head of the SWC's Jerusalem branch, which investigates suspected WWII Nazi criminals, two cases were under investigation in Britain during 2009-10, but Scotland Yard has not yet confirmed this.
Mr Zuroff is also author of the SWC's annual report and said the rise in prosecutions was down to two developments.
"It's clear that we're reaching the end of the period in which this work will be possible. This has motivated countries with the political will to make an effort to prosecute former Nazis.
"There's now a greater sensitivity of Holocaust crimes and more knowledge of them.
"The other reason is that Germany in particular has changed its prosecution policy."
Germany's increase in cases is the most dramatic--from 27 in 2008-09 to 177 in 2009-10.
Mr Zuroff said Germany had changed its prosecution policy to allow more suspects--particularly those who were not officer class and those of non-German origin--to be prosecuted.
Read the full story at BBC News.