Hmm. 250g of worms is 11.25 plus postage, which is enough to make me stop and think. They supply 1kg of worms with their own "can'o'worms" kit, and I had a quick link at franchise operations and discover that the best you can hope for is a doubling of numbers every 90 days - in cold weather probably quite a bit less. So I need to get hold of a decent starter of worms.
Bit of research;
Suitable materials for your Wormery
* Recycled wood from old pallets (check that they are free from wood preservatives as they harm the worms)
* An old plastic/standard plastic compost bin
Building Your Wormery
* Drill drainage holes around the base of a plastic dustbin, approx 5cm from the base., 25cm apart. Drill a circle of air holes 5cm from the top of the bin.
* Fill bin with 8-10cm layer of coarse sand or gravel.
* On top of this place a circle of of wood or polythene with holes drilled for drainage.
* Add a 7-8cm layer of moistened bedding material, such as well rotted compost manure or leaf mould.
* Place at least 100 worms in the bedding. Brandling/tiger worms can be obtained from a mature compost heap, a working worm bin or they could be purchased.
* Add a litre of chopped food to one side of the bin. Cover this with a well soaked whole newspaper.
* Replace the lid and and leave undisturbed for at least 2 weeks for the worms to settle.
Maintaining your Wormery
* Worms will eat almost anything that will decompose. They should be primarily fed on kitchen scraps but they will process weeds and other garden waste.
* Worms like variety. Not too much of one thing!
* Large quantities of citrus peel, seeds and diseased material and meat and fish are best avoided.
* Worms can be killed by overfeeding. Don't add more waste until the previous addition has been composted.
* Keep container covered to avoid fruit flies.
* Don't allow the bin to get too hot or dry out.
* If the heap begins to smell (too wet), pull everything out, mix it well with brown material and return to the bin.
* If the heap remains unchanged (too dry) pull everything out, water it, mix it with green material and return to the bin.
* Ready compost may be stored in medium-sized sacks (30/40litre) in a cool, dry place.
Righto. 100 worms is the least you could use, and that would weigh about 60g, so I reckon a 250g starter would be fine. Before I fork out, though, I'm going to post on Freecycle...