Did a soakaway last week, has to be 600mm from property and holes face away from property, lifted a slab and buried it rather than leaving the top of soakaway level with top of ground as I reckon it is more susecptable to damage and frost, buried the condensate pipe and insulated it, not to installation instructions but I reckon a better job, McAlpine soakaway about £13.00, or make your own from 4 "plasic, you have to buy the limestone chippings extra anyway, I made the hole slighty bigger than stated and used the whole bag of chippings.
Went to look at job this morning, going to run condensate pipe above bedroom skirting, thro wall and into bath waste, will be looking for a bathtrap with connection to solvent overflow.