Mary Berry’s exact jacket was an Oasis Iris print cotton blazer.
It was originally priced at £65.00 in the Spring, then reduced to £25.00 in July.
Unfortunately, it is now sold out 
NEVER MIND…SHOP THE LATEST BLAZER RANGE AT OASIS: http://m.oasis-stores.com/allcoats/dept/fcp-category/list#filters=CATEGORY!blazers&page=0