Factor in £120k for zero to ATPL. Does it make sense? The job isn't what it was, either. Nor the pay. And that's a trend that won't get any better from the pilot's point of view.
If you can afford the PPL go for that. It'll be fun, a confidence booster, and by the end of it you'll have a pretty good idea of what this flying game's about, and whether a commercial pilot career is for you.
If it looks like it still is after you've done the PPL, and you can find the money.... go for it! But that PPL is the start point and well worth doing in itself before you set any commercial ambitions.