Went to Bagshot today, had a great day until i got stuck in 3ft of water and filled the car with water. All was ok then after a short while the coolant temp went to about 105 degrees and gearbox stopped changing down when you stopped, so basically you were trying to pull away in top gear from standstill. This was intermittent until finally all drive was lost. looks like it was pushjing gearbox fluid out from dipstick. Car was running like a dream until 15 - 20 minutes after waterlogging. Any ideas what the problem could be.