I'd second the Meaningful Money podcast; there's a huge back catalogue of episodes to listen to. He's also done a couple of interviews (back in 2019, I think) with the Escape Artist, one of the first FI bloggers I started reading, which are well worth a listen.
I forget to mention upthread that Ms ZiYou's podcast is called UK FI Pod; it's a shame there was only one series as I really enjoyed her interviews. Her voice does take a bit of getting used to as she speaks v e r y slowly in the introduction, but she's fine when she moves on to interviewing people. The Mad Fientist has done some interesting interviews too, although his podcast is a little more US-focused, and he also has an FI progress tracker on his website.
bertie I've found that showing DH how well our investments are doing has made him more interested in it all and he's even suggested investing in some more ETFs. He's also very accepting of me tracking every single penny we receive or spend, but I've always been a bit obsessed with tracking our finances, even before I discovered FI.
Dashel I'm also vegan and we buy very little meat - like you, it's normally vegan meals with cheese on top for everyone but me. I find WFPB (whole foods plant based) a very cheap way of eating as you don't spend much/anything on processed food or ready meals, but the rest of the family aren't convinced. 
I agree that you can save a huge amount of money by planning your own holidays. We had a big holiday a few years ago and I got Trailfinders to price it all up as I thought they might be able to access better rates than I could, but I ended up doing it all myself in the end and it saved us several thousand pounds (even after I'd got Trailfinders to go as low as they could). Plus I actually really enjoy all the planning so it was win-win.
OchreBlue Definitely not too late to start; we still had a mortgage when I was 40 and I hadn't even heard of FI back then - I really wish I'd come across it 10 years ago (although it was much less well-known then). As others have said, you have to decide on your goals - which may not be retiring at 40 (too late for many of us!) or even 50 - but saving money (if you can) and working out the best thing to do with your savings is never a bad thing.
We've just decided to start investing €50 a month for the DC and will definitely talk to them about the importance of putting money away if you have even a small amount to spare. They're already quite good at putting any extra into their savings accounts, but with interest rates currently at 0.00000001% (or near enough!), it's not the place for long-term savings as the money is losing value year on year.