Many children have been left as orphans because of Covid in some developing countries.
I haven't heard of any particular epidemics of COVID orphans, do you have a source? COVID does not kill very many people young enough to have tiny children, older children cannot simply be shipped out to another country with a different culture and language, and in all countries the usual thing that happens to the vast majority of orphan children is that they go to relatives.
In most countries which used to have a lot of children for overseas adoption (China, Russia, all these kinds of countries), it is now extremely difficult to adopt kids and take them to the UK--the laws changed in most places about 15 years ago or so, making this far harder, because of worry about things like child trafficking.
It is still sometimes possible to adopt a child with significant special needs (esp things like fetal alcohol syndrome) from some of those countries, but not everyone feels up to the challenge of this kind of parenting.
International adoption is also incredibly difficult and expensive, even if you can find a child.
I'm not particularly defending the decision to have a baby by surrogate at 50, just explaining why "Just adopt!!" is not the solution most people think it is.