[Closed] Toilet Etiquette Advice please

I've just got the bus to the airport from a visit to cynic-mum. The house will be empty until my sister, her daughter and friend arrive next week.

I did a HUGE unflushable today, was trying to sort it out when the phone rang and after answering that I forgot to finish it off.

My prissy sister will be coming to the mother of all poo-tea's. Do I:
1. Fess up?
2. Say nowt?
3. Email round blaming the last person to stay before me (other sister) saying it wouldn't flush and I wasn't about to roll my sleeves us for someone else?