Have heard good things about this supplier but not used them myself www.peternyssen.com/ Not sure on numbers but a garden designer did tell me its a good idea to plant larger numbers of any one plant than you would think (and plant in drifts and repeat plant)rather than smaller numbers of many different plants. As you have lots of trees in your garden you could try anenomes too they work well in a woodland type setting, the Japanese are white or pink and flower from now till Oct, and the Wood are white or blue flower in the spring. Personally am not not that keen on tulips/daffs/freesias in a border, think they are a bit over stylised, but of course it's all very subjective. Could you plant some perennials and winter flowering evergreens to add some more interest to your garden? Have you looked at crocus.co.uk for ideas? Also this nursery offers a border design service and you can refund the cost against any plants you buy (did this last year in our last garden and was very pleased) https://www.woottensplants.co.uk/index.htm]
The garden was very well planted but we moved away for a while and then kind of lost our way a bit and it got very overgrown with the shrubs protruding halfway across the bottom end of the garden and it being a fight to get the mower round. Last year we had a lot taken out and re-seeded the grass and this year it's seemed, well, flat, really, with very little colour Oh and in March, just before those pics were taken, we had various trees pruned and removed.
My reasoning behind the bulbs is that our local council has done something similar along the verges and I love it each spring when the various flowers start poking their heads out.
Thanks for the heads-up on the anemones - a friend mentioned those last week and I've been trying to rmemeber what she said ever since.