Raindrops are seen on the logo of a rental bicycle sponsored by Barclays in LondonThrough Matt Scuffham LONDON (Reuters) – A British courtroom will this week consider whether tried manipulation of the benchmark interest rate Libor can invalidate loans and other offers or show that banks mis-bought products that were based upon the speed. The Court of Appeal will on Tuesday commence a 3-day hearing examining two separate cases brought by means of shoppers in opposition to Barclays and Deutsche Bank. It’s expected to hand down a landmark ruling later within the year, according to sources familiar with the instances. …