Feel free to define lesser known how you like. Here's my list. Most of these have fewer than 100,000 subscribers. Some of them have fewer than 10,000 subs.

Al Brady (32k subs)

Has a nice mix of sweet and savoury food. Has a lot of videos below ten minutes - there's a rapid pacing here that avoids the problems of TikTok / YT Shorts cooking. Enough time to explain what he's doing, no useless padding.

Baking on a Budget (40k subs)

A reasonably new channel (only 33 videos as I post this). He has a method for pricing the recipes, and we can always argue about whether that makes sense or not, but at least it's consistent across his videos so viewers get an idea of relative costs. The recipes are simple. They're aimed at providing tasty filling food for cheap. The production values are low - no fancy lighting, no fancy camera, the kitchen table looks a bit rickety.

BoSFinesse (6k subs)

He's from Bristol (South West UK) and has the regional accent to prove it. He visits and reviews street food and cafés. I love videos like this - show-casing normal eateries. It's rough and ready - he sometimes includes swearing. And he's usually positive, or occasionally very mildly not positive. But I like that. He does a mix of shorts and long form - the long form does tend to be a bit calmer and explanatory.

Bread and Food (400 subs)

Features food, mostly street food or bread, from Iran. I like the "show don't tell" aspect of these videos. There are loads of street food videos and I watch quite a few. Lots of videos are presented by people that I don't enjoy watching.

YumTopia (5.5k subs)

Another street food channel, again from Iran. This is the video that I really like - street food often looks like it has been rapidly cooked, but there are examples of slow cooked food. https://www.youtube.com/watch?v=HDJowrQQisg

The Staff Canteen (152k)

At over 100k subs this probably doesn't belong here, but I think this fits here because many of their videos get fewer than 1000 views. Views are picking up recently. It's a great channel if you're interested in fine dining in the UK. There are a huge number of interviews with some very very good chefs here, and often they demonstrate one of their dishes.

Pete's Pans (9.5k subs)

He researches regional dishes from France, Spain, and Portugal and he claims to present traditional "authentic" versions of various dishes. I've only just started watching, and I'm not sure if I'll end up finding that he's not for me.