I think La Vieja Fabrica is giving Frank Cooper a run for their money! Both of them sound like really high-quality marmalades to me 
I mean, who doesn't love a good balance of sour and sweet? And £2.15 is super cheap for 365g? That's like, a steal
I've been using Morrisons' one for ages now and I'm totally hooked on the Seville Orange flavor... but Frank Cooper's Oxford marmalade does sound really appealing too
Maybe I'll have to give it a try next time I'm at Tesco 