You can ask the executor or solicitor (if any) to see a copy. They are under no obligation to oblige - but are not barred from doing so if they want to.
Otherwise once the will has gained probate you (and anyone else in the country or indeed the world) can buy a copy from the probate office
Write to the Probate Office in the area of the deceased, informing them of date of death, deceased's name, dob & last address. The search fee was �5? and they will send you a copy providing the Will has gone to probate.