i have mint, rosemary, thyme, and a curry plant thing. what else can i use to fill it up and have an enormous herby garden ???

Basil, Oregano & Corriander make good plants too.

Lucky you!

Angelica is a lovely annual that grows to about 6 ft and gives a bit of perspective to a herb garden. You can candy the stem and use it on cakes but mostly it looks pretty especially when flowering.

I also have a few weird and wacky things like bergamot (not sure what to use it in but it's very pretty, smells lovely and is quite moderate in its spreading habits)

You definitely need chives and garlic, no?
Sage. (in stuffing)
Sorrel (good in soups). A friend recently gave me some lovely red-veined French Sorrel, which is very pretty as well.
Oregano for putting in salads etc...
Chamomile for the flowers for tea

I'll keep thinking about this.

< later > It occurs to me to mention that you can eat the flowers of most herbs as well- mostly in salad: all the allium family (garlic, leek, chive etc..) can be eaten, along with thyme, oregano etc. With this in mind, you might also want to grow some nasturtiums for their flowers, that are delicious in salads! They are a little spicy but slightly sweet, and make a salad look wonderful!

I have an enormous herb garden so in mine are;
Rosemary (blue, white and prostrata) Golden marjoram, Greek oregano, chives, bronze fennel, sweet cicely, angelica, hyssop, lemon balm, lemon verbena, chocolate pepperminti potted, sage, thyme (several varieties) lovage, savory, tarragon and surrounding it all is a lavender hedge

All good sugestions, except maybe the banana plant, they will not grow in the UK.
Plant them all and see what Gaia grows for you.

She is the best gardener.