I have followed the standard advice with the spuds I have planted so far, but someone (Thompson & Morgan?) says that it is unnecessary and that you can fill the bags planting the seed potatoes in the top 4" and they will spread down just fine. Might be worth a google? I think if you plant deeper than 4" the plants are likely to run out of starch to feed them before they break the surface, which is why you are supposed to earth up after the plants have some leaves to get energy by photosynthesis.
I have no idea how long spuds take to get big, you might have a chance of growing radishes around/between them but if you have early spuds the radishes might be too slow getting started at this time of year.
What I have done for the last 2 years is sow rows of spinach, peas and carrots (although I'm planting carrots in areas now rather than rows, and trying peas in troughs) at the correct spacing, and sow a row of radishes in between, so if spinach rows are 12" apart, the radish row is 6" from each. Radishes have always been quicker than spinach, carrots or peas, but don't get too ambitious, however small the others look when you harvest the radishes you can't get a second crop in before they overshade the radish rows
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Not at all! I'm happy to come out with just a carrier bag.
Not heard the likes in our Aldi and I wear my lippy to go in there..don't call my Margo Ledbetter for nowt
You Margo me Jerry!
Before my time, of course. 
Hello Watery, perhaps your Wilkinsons lady meant, boil your potatoes in the bottom of the pot and steam your carrots over the top?
I understand the transplant bit, but i though spuds would grow from the bottom of a potato bag enabling me to sow radish seed in the top.
i think I will sacrifice a bag and let you know the outcome later in the year.
I have followed the standard advice with the spuds I have planted so far, but someone (Thompson & Morgan?) says that it is unnecessary and that you can fill the bags planting the seed potatoes in the top 4" and they will spread down just fine. Might be worth a google? I think if you plant deeper than 4" the plants are likely to run out of starch to feed them before they break the surface, which is why you are supposed to earth up after the plants have some leaves to get energy by photosynthesis.
I have no idea how long spuds take to get big, you might have a chance of growing radishes around/between them but if you have early spuds the radishes might be too slow getting started at this time of year.
What I have done for the last 2 years is sow rows of spinach, peas and carrots (although I'm planting carrots in areas now rather than rows, and trying peas in troughs) at the correct spacing, and sow a row of radishes in between, so if spinach rows are 12" apart, the radish row is 6" from each. Radishes have always been quicker than spinach, carrots or peas, but don't get too ambitious, however small the others look when you harvest the radishes you can't get a second crop in before they overshade the radish rows