Thanks for your reply.
A Will only comes into operation on that person's death and only relates to assets held by your Grandmother at the date of her death.
Therefore, I am afraid to say that as you have been left a specific legacy of part of the bungalow, this legacy to you and the other beneficiaries fails as the bungalow had been sold during her lifetime.
Only if the wording to the legacy included the words in capital "I leave my bungalow OR IF IT HAS BEEN SOLD DURING MY LIFETIME,ANY REMAINING PROCEEDS OF SALE FROM IT to X Y and Z" would you be entitled to claim your percentage share.
Accordingly, the monies from the Sale of the bungalow fall into the "residuary Estate" and passes to this/these beneficiaries (ie the ones who have been left the percentage of the Estate).
If all the residuary beneficiaries are in agreement, the terms of the Will can be amended so that you and your brother do indeed receive some money, but they all have to agree to this, and they are not under any legal or other duty to agree to do this.
I am sorry this is not the answer you were looking for, but it sets out the legal position.