I bought a pack of CafePod capsules from Morrisons, and have to report that the results were very disappointing.
When I put the capsule into the machine, I experience slightly higher resistance when depressing the charging lever (this is expected, as per the capsule instructions) and, initially the coffee comes out at the usual rate. However, after a short while (around 5 seconds), the stream of coffee slowed down to a trickle then a drip. I tried 2 capsules in the machine, and with both I experienced the same unsatisfactory results.
The time to make an Espresso cup of coffee took more than twice as long with these CafePod capsules as would take an original Nespresso capsule, and the resulting coffee was very bitter.
The coffee machine is otherwise working perfectly, producing cup after cup of coffee using original Nespresso capsules.
I'm returning the remaining capsules to Morrisons for a refund.