Well, I bought a table last year from here: www.hookedonglamping.co.uk/table.html
and painted and decorated myself which, with my lack of creativity, was challenging. Also some hooks from the same place which were useful to hang up keys and other easily lost items.
Also a tea light chandelier which we got from the White Company in the sale last year after a tip off from shirazplease, plus battery operated tea lights. If you google tea light chandelier there are lots of different options.
For sitting we have moon chairs which are comfortable though definitely take up more space in the car. We have a massive superking airbed with proper duvet and pillows, which is great as DD tends to sleep with us.
For eating we bought an Outwell metal and bamboo version of the plastic table and four stools fold-thingy you can buy everywhere. We got ours in Halfords in the sale. If I was buying again, I think I would get an all aluminium one as ours weighs a ton.
For cooking we have one of these:www.obelink.co.uk/camping-accessories/camping-furniture/hypercamp-ambassador.html?category_params=s_company%3D4%26category_id%3D4252%26page%3D2, although I am not sure that it is particularly glampy.
We have a load of brightly coloured melamine picnic stuff for eating but I noticed the other day that BhS are doing a line of really pretty stuff this year which seems quite reasonable priced.
Lots of collapsible stuff too - kettle, bowls, washing up bowl etc. all in bright colours.
I think that is about it, although I keep promising myself to make bunting. So far not got anywhere though.
We have nothing particularly glampy for kids I don't think - apart from an IKEA sheepskin rug thing DD used to sleep on when she was a baby for extra insulation over her mattress. We had a Littlelife Arc 2 travel cot for her as well - again, not especially glampy but extremely practical.
We used to have proper storm lanterns which were quite nice but have temporarily abandoned those in favour of battery lights until DD is a bit bigger.
Throws and tablecloths and cushions are brilliant for glamping up your tent, which I see you already have.
Have a brilliant summer 