Posted: 14/04/2016 at 17:21
You could get your pea seeds in now, as long as there's a bit of rain they should be OK. It's a bit late to start tomatoes from seed now, and they do need a bit of coddling at first. I think your best bet would be to buy them as plants as soon as you're back from holiday. Outdoor tomatoes shouldn't go out until well into May anyway.
Carrots could be in by now but it's not too late to sow some. As to herbs, you can buy the perennial one in pots (e.g. thyme, marjoram, mint, sage) and put them in the ground any time you like.
Runner beans or climbing French beans are good for a small space as they can be trained up a fence or a wigwam, and it's OK not to sow these until May.