potatoes

we grow over 25 kilo late spuds red potato do well on our ground so we grew desiree late and some various varieties for early around 5 kilo 

however on my daughters allotment some 15 miles away things are different the spuds have a scabby skin they look bad but it doesn't seem to effect the taste when scraped or pealed so what in your opinion what causes this is it the soil the variety I plant her potato crop and there planted in the same way as I plant my spuds in my allotment?

the other question is we grow some of our early potatoes in potato buckets in compost they crop pretty good but when we boil them they all break up sow we have to under cook them is it the variety what can be done to overcome this

RHS advice re:scab

Non-chemical control
•Select seed carefully and avoid planting seed potatoes that have visible signs of scab. Legislation controls the amount of infection allowed in seed, but low levels are permitted
•To control common scab, do not allow the soil to become dry during tuber development. Raise organic matter levels to improve water retention. Water the developing crop if necessary, starting two to three weeks after plants emerge and continuing for about four weeks, applying 20 litres per sq m (4 gallons per sq yd)
•Common scab is worse on alkaline soil, so liming the soil to prevent club root of brassicas will predispose to common scab in potatoes. Apply lime after the potato course of the rotation
•Choose resistant cultivars. ‘Accent’, ‘Arran Pilot’, ‘Juliette’, ‘Golden Wonder’, ‘King Edward’, ‘Pentland Crown’ and ‘Pentland Javelin’ show some resistance to common scab. ‘Desiree’, ‘Hermes’, ‘King Edward’, ‘Pixie’ and ‘Sante’ show some resistance to powdery scab
•AHDB Potatoes produces the British Potato Variety Database, which lists pest and disease resistance on a one to nine scale for many varieties and is a valuable guide to variety selection if any particular pest or disease is known to be a likely problem. For more information visit The British Potato Variety Database

Yes, as said, steaming is best for newly dug potatoes. Once out of the soil for a few days they seem to break less, but sometimes that is at the expense of the 'new' taste

thanks all I've got the message very helpful in the  future understand what's needed to grow scab free potatoes