I'm very careful about the fat and salt content in what I eat. My general rule is that no ingredient should have more than 3% saturated fat (clearly exceptions have to be made when using oil to cook, but the quantity can be limited). My 3% rule also applies when when buying pre-packaged food, for example, crisps.
Here's the good news.....Walkers Baked crisps (and most other kinds of Walkers crisps) are on my 'allowed' foods list.
They really don't contain anything much, and they taste good, especially the salt and vinegar ones! At 0.4g of salt per pack, it's a bit higher than I'd normally have, but ok if i'm not planning on eating any other salty foods for the day.
Be aware that they have quite a high sugar content, eat in moderation and enjoy. I do!
'Healthy' diets can seem like a drag for quite a while after you start them, but stick with it. After a few months you wonder why you didn't start it years earlier. I still enjoy some horrendously unhealthy foods from time to time. There's nothing I like more than a cheese platter after a meal out - but I can have it knowing that eating such foods every couple of months is going to do no harm at all.
Good luck :)