I have just realised that this is a bit late...but for next time.I was told 24, maybe the 26.5 was for sweet. You could mix it with sugar free lemonade, or soda to spin it out a bit. I hope you enjoyed your night.
The say for women no more than 14 units per week. A 175ml glass of wine is 2 units and 6 syns. (A 250ml glass is 2.85 units and 8.5 syns)
So you get up to 7 x 175ml glasses a week (or 5 x 250ml glasses) or 1.225 litres, which is a bottle and 2/3rds. A bottle of dry white wine is 25.5 syns