Hi, London pride is a saxifrage and is still readily available. Heuchera's are a different group of plants altogether.

I think it was Bamboo who referred just a few days ago to a Heuchera called 'London Pride' as there was some confusion with the Saxifrage with the same common name on that question as well. I couldn't find a Heuchera 'London Pride' on the RHS plant finder database.

Here in London, the plant commonly referred to as London Pride is actually Heuchera Red Spangles, not saxifraga urbium - google for pics of Red spangles and seek that out if its what you mean. Usually readily available, specially in early spring when it can be bought in small pots for about £1.99.