Hi Finland. Seems your HV has been giving bad advice
The research behind weaning shows that when born baby's stomachs are permeable, to allow them to absorb the milk easier to digest. Only milk should be entering the stomach when it is permeable to avoid possible allergies or stomach/digestion problems in later life.
Somewhere between 17-26 weeks the stomach becomes unpermeable, and 'seals' which is when the baby is physically internally ready for solids. Unfortunately we can't tell which baby is ready at 17 weeks, and which is ready at 26! That's why they say to wait.
It has been suggested though, that once your baby can sit unaided, grab food, put it in their mouth, chew and swallow that they are likely to be ready internally, until then nature wouldn't allow us to be developmentally ready and we would fail at some point in the process. This normally occurs at some point around 6 months and because of this, there is no need for purees. Pureeing food is purely because babies do not have the ability to chew before this time.
Please try not to worry about starting 'late', any time from 26 weeks will be fine, I'd either start on holiday, just giving baby some carrot or something, or wait til you get back.
Have you had a look at Aitch's blog?