[grendel]

first have a look up the pole, and check if it is BT or electric - then contact the relevant company, and explain what has happened and ask them what they are going to do about it, hopefully you can get them to pay for replacement plants, and maybe even replace the contaminated soil too. (get them to responsibly remove and dispose of the old soil, as that will cost them if they do it properly)
Grendel

[RichardA]

was the pole concreted in ??They are not always. If so concrete is alkaline and with wet coinditions that may be leaching out very slowly - strawberries may like acid conditions
R