Call Jonathan Pie is a BBC Sounds show that I've been enjoying over the last month or so. If you're familiar with Pie on Youtube then you'll know what to expect; and if not, then it's a fictional radio phone with, well Jonathan Pie.
Shoutout to Reasons to be Cheerful for always making me feel a little more positive about the state of the world.
Three bean salad - you have to start at the beginning, it won't make any sense otherwise - it barely does to me and I've heard it all. Surreal comedy.
Hamish and Andy - again, start at the beginning, its good clean fun. Just three mates doing silly, harmless things.
Where there's a will, there's a wake - Kathy Burk interviewing interesting people about thier dream funeral. Adult humour.
The boring podcast - short lectures by different people on things that sound boring but become fascinating such as, Hb pencils, double yellow lines, street furniture.
Pop culture parenting - they take a famous scene from a different movie each week and break down how it shows good or bad parenting techniques. Great for anyone with young kids.
I've several more if those don't tickle your pickle.
I second Three Bean Salad. It's Mike Wozniak (from Taskmaster and Man Down etc) and two of his comedian friends having some lukewarm banter.
I wouldn't say it's overly surreal, but it's a conversational mostly-improvised comedy podcast with some surreal and fantastical humour. Starting from the beginning helps you to understand all the in-jokes.