What saying "warms the cockles of your heart"? - could it be the understatement in "mustn't grumble" or maybe the banter in a phrase like "a face like a dog's ass"

either "knackered" or "that's pants"

Barking Mad. Just saying it out loud still makes me laugh, 10 years after the first time I heard it. And of course, Mind The Gap.

"It's a bit blowy outside!" What a hoot! That was such an exageration! It was downright freezing out!

I like "barking mad" too. I also like how they call a run in stockings a ladder.

"My giddy aunt", and "Easy peasy, lemon squeezy".

This one isn't really a saying, but a greeting (although I didn't know it at the time)

"you alright?"

All of DH's family kept asking me this; I had to ask DH if I looked tired or ill. He cracked up telling me that it's just the way they say "how are you?"

We normally just say "barking" these days.

Whence the (sometimes) careful gradation of mental states that are beyond Barking on the tube, with Upminster about as doolally as it's possible to be.

"Skiving"! And I'm very good at it.

I love "what a wanker!"

"Sunny intervals" on their weather forecasts; "Knickers in a twist"; "Getting Better" (that's what the GB on their license plate stands for.

"Mind the gap"

Over the moon! Old, I know, but I love it.

Wanker is excellent, also.

My All-Time favorites :
gobsmacked
barmy
snog
gormless
and Bobs Your Uncle!!

Please, people, 'wanker' is NOT a word I would use in front of my mother, so be careful how you throw it around when you're here! LOL

"W...ker" is not polite! [not sure if OPs revelling in this phrase fully aware of this from what they have said!]
When we moved to Cornwall 9 years ago, it took me about 6 months to realise that "allright?" was not an acutal enquiry after my health. My kids and I now play a game where we have an entire conversation comprised entirely of this one word - try it!
A good Cornish one is "dreckly" - like "Manana" but with less sense of urgency.

My daughter enjoyed the expression a little boy used when asking for his turn at a museum activity; "May I have a go at it?" And both of my kids loved the underwear advertisement that utilized the Underground warning "Mind the Gap."

I'd use the word in front of MY mother. Heck, my mom might even use it herself

Blimey, I've never even heard my bother say 'bloody'

bother = mother. A type, not a slur on her character