I'm in two minds about buying one for while I'm away on holiday on one hand I'm off to Egypt so who's gonna be able to read it an while on holiday I doubt ill be more than 20yrds. from the rest of the family
That is marginally justifiable. Arabic is not the only language spoken in Egypt. Also, Epilepsy is not confined to only those in the English-speaking world.
You didn't state your age. So being in a foreign country, maybe your family will 'keep you on a leash'. Then again, being in a foreign country, and getting separated for even a moment, could end up being very bad.
I was born in Germany, back in 1967 to American parents who both could speak German fluently. When I traveled to Tunis(Tunisia) in the 1970's, communication was a bit of problem since that is an Arab-speaking country in North Africa. But I was 10yrs.-old, and traveling with my mother and two of her friends. So they were always close by. When I traveled to Amsterdam, then Rome, when I was 11yrs.-old, it was the same situation. People do speak English in those countries.
When I traveled to back to Germany, then to Switzerland, Poland n' Hungary, when I was 24. The same situation applied. But in Germany n' Switzerland, I could communicate in German, since I had learned from learning about my birth country. Poland n' Hungary do have English, but it is not as wide.
So get one ASAP, regardless of any reservations concerning your trip.