I have finally made up my mind. To be honest I have made up my mind ages ago, but I needed to make up my wife's mind too, and sort the finances for this step as well. Yes, it's official now - I am buying a Bakfiets Cargobike Long. This is going to be our weekend bike to carry our two offspring and groceries, to go for family rides - basically to replace the car (which we never had). The decision was hard especially since it doesn't cost peanuts. £2000 however is what I would probably pay for upkeep of the car only annually, so in the end it's not that bad. Plus it's and investment. These bikes are meant to withstand the elements for at least 30 years of faithful service and not deteriorate on little bit - which means I can sell it when I don't need it any more (when that would be I don't now).
I still have a trailer which I used to use with my road bike but it just seemed so awkward, wide I had to assemble it every time I felt like a ride with my son - plus the only thing he saw from there was my bum and the curb. No I'll get to speak with him while riding - the bonding is well worth £2000. I'll report again when I get it - should be about two weeks from now.