I Have Been Taking 2mg Diazepam For Anxiety...only When Needed.

I have been taking 2mg diazepam for anxiety...only when needed. I am on vacation and have run out of diazepam which I need to relax me on my 11 hour flight back to London. I have managed to get hold of some 1mg lorazepam tablets and wish to know if there'll be any problem taking this instead of diazepam. I am currently taking Paroxetine 40mg per day and lamotrigine 300mg per day.
I would really appreciate your advice. Thanks.