There is no evidence that electoral fraud is a problem that needs solving, and if you wanted to reduce the risk of fraud then you would restrict postal voting first. (NB I wouldn't do either of these things unless there is evidence to support them).
The U.K. needs free official ID cards before asking for ID at polling stations.
European countries which have ID cards usually provide them free, citizens have them from childhood, they have a very long validity period (they remain valid for some purposes even after expiry) and most citizens carry them systematically. That would require a big cultural shift in the U.K.
It's already easy for citizens to end up disenfranchised in the U.K. and we shouldn't want the number of disenfranchised citizens to increase.