I was riding down, then on flat lol. But soon as i sat on the bike seat and peddled the seat would slip back gradually then the nose would be pointing to the sky
Thank you all for being so helpful and lovely and understanding you've truly made me feel really welcome and helped loads!!
Thank you all for being so helpful and lovely and understanding you've truly made me feel really welcome and helped loads!!

the post slid down abit tho!
Sounds like something has worked loose. Stand off the bike, apply the brake, rock the bike back and forth, and see if anything is moving or making a noise. It's usually easy to spot what is making the noise, but harder to put it right. Brakes can be tricky büggers to get right. If it isn't something obvious, I'd suggest the knowledgeable mate/bike shop route. You don't take risks with brakes.