Just a word of advice from someone who spent 30 years in the medal trade. World War 2 stars and medals were issued unnamed and as such are all identical, unlike modern British campaign medals which are individually named. Replacements are not free, and it would therefore be worth checking the MOD quote for replacements, which has already been stated will be recently struck, and compare the price with that for old medals which are widely available from reputable dealers. In many case the latter method may prove cheaper, and you will have old medals, not recently struck ones.
Btw, lest it be thought I am touting for trade I should point out that I am no longer dealing, so I have no financial motive in offering this advice.