I've just come back from the LFS. Got some filter floss and some tiny shells to put in my filter to see if they make a difference to my hardness. It was £1.60 for a bag (just couldn't afford a £30 of crushed coral or similar), so not a big deal if it doesn't make much difference.
Also, I'm the legal owner of some fish now! They only had 6 leopard cories left (at first I thought they only had 5 and was about to cry! But one was hiding), so I paid for them and am going back next week to pick them up. So, I'm getting fish next week even if I have to fish-in the rest of my cycle. Hopefully by next week I'll be somewhere in my qualifying week so it won't matter anyway. I'm sure I read somewhere that to be cycled you only need to be clearing the ammonia and nitrite in 24 hours, but we go for twelve to be on the safe side. Mine is clearing in less than 24 hours now so everything should be well.