Planting Seeds – Dates and temperatures.

Today, I've been busy sowing my summer bedding plant seeds (and a few veg). Here's a photo inside my little propagation greenhouse.

I can't find much on the net as to when exactly to plant seed, so I thought I'd let you see what I'm up to and ask for your methods and planting times.
Here's what I planted, along with some useful information on temperature, technique, etc

Flower seeds planted. (I can't get the degree sign so I'll just put C for degrees centigrade)

Antirrhinum Floral Showers. (18-20 C) Cover lightly with Vermiculite.
Fever-few (Matricaria) (Chrysanthemum Parthenium Santana) – so many names. (15-20 C) Cover lightly with Vermiculite.
Dahlia Figaro. (20 C)  Cover lightly with compost.
Dianthus Diana. (21 C) Cover lightly with Vermiculite.
Digitalis Camelot (Foxglove). The seed catalogue says to sow the seed on the surface, but I've covered them lightly with Vermiculite - so fingers crossed. Usually, Foxgloves flower in their second year, but, Camelot is a new variety which is supposed to flower in the first year – that'll be nice.
Nemesia Poetry Lavender. (15-18 C) They don't like to be too hot as this hinders germination. Cover lightly with Vermiculite.
Petunia Mambo. (20 C) Cover lightly with Vermiculite.
Petunia Spangles Pink Morn. (20 C) Cover lightly with Vermiculite. I've not tried trailing petunia from seed before – could be interesting.
Sweet Pea Spencer. Lots of people say that now is a bit late, but I prefer not to have them hanging around in their pots.
Verbena Tuscany. (18-25 C) – seems like a big temperature range. Cover with almost dry compost as they are sensitive to too much damp.

Flower plugs.
I also buy some plants as plugs as certain varieties take too much time and heat to start from seed.
I've already received Bedding Begonia, some mixed Geranium (there's some separate red and pink on their way) and Impatiens (Busy Lizzie). I know there's that disease on the Impatiens, but I thought I'd try a few - this way I'll be the only one with any to sell ;)
Another of my favorites is Non-Stop Begonia. I've got some on their way, and I'm trying Mocca this year – they're the ones with dark leaves - don't know if they're any good but I'll soon find out.

Veg seeds planted.
Cabbage greyhound. I sell a few plants and grow some on to eat myself – in the tunnel they grow super fast and the caterpillars can't get to them.
Parsley – always good to have around.
Tomatoes Alicante (good old reliable) and Super Marmande a beefsteak variety. These I sell as plants and keep a few for myself.
I've also set some onion sets in the tunnel as it seems we can never have enough onions.

I know that times will vary over the country, but this is a start for us in Pembrokeshire. Let me know if you found this useful and if you have any secret tips to share with me.