It's quite a simple process to book this flight. Simply go to travelpack website and select either 'London Gatwick' (not London -
all) or 'Manchester' from the 'departing from' box, put 'GOI' (the airport code for Goa) in the 'travelling to' box, 11/04/08 as the departing date and 19/04/08 as the return date. See attached screenshot.

You'll see the price come up as £196 per seat. If you book this with a debit (not a credit card) you'll pay no credit card fee. Just enter the passenger details and you're away!

I've checked and all of this information was working a few minutes ago, so you should be in luck if you book soon.