Indian sandstone nightmare - Options for fixing indian sansdtone

[tornado]

HI there - I am new to this but need help. I have a patio 'professionally' laid on a concrete base during winter and all slabs are loose and squint and wonky. We bailed out with builder at this stage and have relaid about half of it properly. I am now at the stage of suicide and am wondering what is the quickest way of fixing the rest which are relatively flat and ok but just not stuck down. Can I bed them onto sand on top of existing concrete base? Should I just glue back the ones that are really loose and grout the lot? Or am I destined to more weekends of torment? Thanks..

[lutonlagerlout]

have you read any of the main site here?
weekends of torment methinks
I would suggest read,read and read again
cheers LLL