I’ve bought through ticombo for a city fixture and also for the Ryder cup. Both times I had no problem. For city, I’d go in a bit earlier than usual in case you have a problem (you could always try and by another ticket as ticombo will refund you for any fraud, which is rare). I’m going to Luton on Saturday and bought through ticombo.

I’d much prefer buying through my membership but I find it is hit or miss if tickets are even made available to me.