Fire Ash

Hi everyone
Just thought I would ask a stupid question.
I took over my allotment in August and guess what ... it was 3 feet high in weeds all over.
So I have been digging all the weeds out by hand and burning them.
I have now got the whole plot done and cultivated it with a rotovater,
But I now have a big heep of fire ash left from the burnt out weeds.
Can I spread this throughout the allotment and will it do good or harm to the soil.
Thanks your answers will be appreciated
Iceburg

Well done you for all your hard work! Yes - the ash will be beneficial to the soil.