Dan Walker has wished his co-host, Louise Minchin, a happy birthday - despite "abandoning" her on Wednesday's BBC Breakfast.Taking to Twitter to reveal why he wasn't in the studio, the presenter remarked: "Happy birthday to the magnificent @louiseminchin… who I have deserted to play in the @BMWPGA pro am and do some #Strictly stuff #BBCBreakfast."MORE:BBC Breakfast's Dan Walker reveals why he didn't tell Louise Minchin about StrictlyWATCH: Louise Minchin tearfully confirms BBC Breakfast