Posted: 16/01/2015 at 11:22
Baz - I see you've had a few reliable tips elsewhere. However, from what you ask I would just add.
Sweet peas are best grown in the same pots from seed sowing to planting out, because they don't like root disturbance....hence no potting-on/off.
'Prick the leaves off'? I presume you mean pinching-out. Best to nip out the growing tips when they have two or three pairs of leaves (detailed pictures on the previous page of this thread).
They prefer a sunny, open situation and don't plant too thickly, otherwise they'll be troubled with mildew later in the season.
Finally, expect them to grow to at least 8 feet, so support accordingly.