i've used the watties baby musli...its in a red box, normally beside the farax ones. There are also fruit flavoured ones as well, some say 7-9 months but Joels been on them since he started and has had no problems.
I make his food thick but not as thick as just mashing it. I normally water down his fruit so I can add baby musli to it to thicken it. Tonight he had potato and pumpkin mashed with gravy and half a tin of lambs fry and bacon mixed in...he ate that fine. (the mash was leftover from our dinner and I had mashed it with butter and forgotten but he was fine with it)