Oh Lordy, it gets better. I tried another email address for 'website issues' and sent them this polite request:
Hello, I'm trying to update my Europcar profile with two more frequent flyer numbers
BMI British Midland - xxxxx
KLM Flying Blue - xxxxx
Ive tried to do this online, but keep getting an error message '???en_GB.character.forbidden???'.
Please would you fix it for me.
Thanks,
mad_rich
EUropcar ID: xxxxx
Triple BMI miles and a cheese toastie to anyone who can guess how they replied (a very creditable few minutes later).*
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* Cheese toastie subject to availability and regulatory approval. Triple miles will only be awarded if triple miles coupon is present. No coupons accepted. Cheese may contain nuts.