Maple syrup with sucralose is a not real maple syrup, it's a sucralose sweetened syrup that is maple flavoured. It's a product available in America and Canada but not in the UK, at least not that I've found.
Sucralose and aspartame are two of the best artificial sweetners as far as having a clean sweet flavour with little aftertaste. Sucralose can be used in cooking, aspartame breaks down in cooking and is best added once foods have cooled below the boiling point or for use in cold drinks and cold desserts.
Flapjacks could be made with sucralose (Splenda or the store brand equivalent) but I would add a tablespoon or two of applesauce to give a similar texture to what you would have using a fructose based product.