All I remember of McDonald's in the UK, beyond the Big Macs (which were pretty similar to the US), is the horribad breakfast me and the hubby had. We were moving house while I visiting last year, and we were moving boxes from one house to the storage unit, and we were hungry--it was too early for a sit-down breakfast, and his kitchen was completely dismantled. So, we went to McDonalds mostly for a coffee/tea run, but my husband got some bagel egg and bacon combo--I can't remember the name of it to save my life. But what really blew my mind was that there was ranch dressing on it--my husband took a bite, and then asked me to take a bite since he's not really familiar with ranch dressing and wasn't sure what it was. Lo and behold it was ranch, and I just made a weird face and handed it back to him
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I'm not entirely sure if it was a mistake or what, but we haven't had a breakfast at a UK McDonald's since then so who knows what happened to it.