I think I got this reduction, without even asking! Well, I got a letter saying my rent would go down from 1 November - I know that because it was the numbers bit. As to the rest of the letter, presumably explaining what happened and why, I'll wait till I can get someone to translate for me.

Common sense says it's got to be related to this interest rate thing but I'll have someone check the letter just in case it says 'and we promised your soul to satan'!