Ask for the gammon to be grilled without oil, then cut the fat off and it would be free.
Salad would be free, aslong as there is no dressing. Ask for it without dressing, or on the side so you can decide how much/little to use.
If you can get them without any butter/oil on, the new potatoes would also be free.
The main thing would be the fried egg. I think 1tbsp oil = 6 Syns, but you can never really determine how much oil has been used.
Why not get gammon with pineapple and swap your chips for a jacket potato and salad. That would be completely free!