I found a cheaper and easier way to get to Venice. I chose the date of 15th as the minoan leaves Venice on the 16th at 14.00 hours. In the winter it only goes to Corfu once or twice a week.
15 Jan Glasgow to East midlands with bmibaby 8.40 am cost £2.99 plus £20 tax (£22.99) arriving at ema at 9.40am
15 Jan East mids to Venice with Easyjet at 12.55 pm cost £21.99 total price. arrive Venice marco polo at 16.10 pm. Hotels can be found on the easyjet or minoan websites
Total cost of reaching Venice £44.98, cheaper than flight then car hire with petrol and you don't need to drive.
Overnight somewhere near Venice which you would have to do anyway with your flight and then the ferry next day at 14.00. Deck passenger is only 54 euro or reclining seat 75 euro. Arrive in corfu next day at 11.30am