Block-paving

I use a gas fired weeder(Lidl or Aldi) on any blocks/slabs or paths we have seems to keep them clear,

ps No bending either

Oh right. Never gave that a thought 😂😂. 

Yep, flame thrower could be good!

When MIL was alive she used to use a weeding knife type thing, fits between the blocks, plus pulling them out when they appear also works......do not let them get too big.

We only have the blocks on the driveway out front, so these days we use weedkiller every so often.  Once it dries it does not affect animals.....not that we get many walking over our driveway.

Ours has been in place 30 years, no membrane below the blocks, we laid it ourselves......80 square metres.

Personally I would use a weedkiller. Providing it is used in accordance with the instructions the risk to wildlife or pets should be very low according to the Telegraph. The problem with the weeds in block paving and any other type of path is that you need to kill the roots as some of the things mentioned are very difficult to get rid of completely by other means. 

David

Sadly the weed killer did nothing over and above our usual method 😔.  We have neighbourhood cats, foxes and hedgehogs that we know of. I like the sound of the weed burner and have just been looking at them. It's odd ones that grow rally,  most just lie low - like they've learnt before 😂.  OH cut grass today and some diaries and white clover flower below the cut level cheeky things but it leaves them for the bees and butterflies 😃

Agreed, a nice glyphosate would sort them out in no time down to the root with negligible / no risk to wildlife. 

I use it all the time on the gravel and round the fruit trees.

Some people have an aversion to "chemicals" (GMO's, Gluten etc.) though from reading to much 'natural news' and the like!  

Option 1--weed killer 2/3 times when good weather guaranteed. then jet wash all the paving and let it dry, next fill joints with kiln dried fine sand and a very soft sweeping brush and move sand around all over paving. sweep excess of then seal with a good block paving sealer and let dry. then apply a second coat of sealer and let dry. sit back with a glass of what you drink and admire the hard work you have put into it. good for 12/24 months before needs doing again.

Option 2--ring a driveway specialist and pay then to do it and you can drink while you watch them.

There  are  also  mains  electric  weedkillers  --  with  the  same  advantages  as  JVB  says  --  you  get  a  nice  gentle  walk  &  no  bending  unless  you  drop  your  packet  of  biscuits 

Weed suppressing kiln dried sand is available (try google). I thought about using it when i resanded by front drive earlier this year but thought it was expensive so used normal dried sand and i will continue with the weed killer.