roundup function by 5p

Hi, I have a list if prices that have had margins and other cost-to-sell math done to them. I now have a list of weird un-natural looking prices like £17.81 or £23.43.

I'd like to use a roundup to the nearest £0.05 but all the functions I've tried seem to calculate larger chunks. I may need mround or something but not sure. Any tips would be great.

Ahh the ceiling function.. I knew it was something like that. Thanks a bunch, works a treat and saving me some head scratching!