I can't help but feel that immigrants have a rake of kids, yet the local population either can't afford them or have been actively discouraged through various means anyway. In some countries, they incentivise the population to have children, either through once off allowances, tax incentives or monthly subsidies. What do you get in the UK - not anything worth it currently. Of course, as an immigrant, you likely get a stronger case to stay - add that to cultural differences about having as many children as possible which also exacerbate the situation.

I think you need to learn to read. What I wrote was not about population trends per se but about the lack of attention to the contribution that increasing longevity makes to them.

Overall population trends are complex issues with several contributing factors. The fall in the birthrate, well below replacement levels, is an important one, but it is already so low that any further fall cannot impact it much more. Mortality rates though are going to continue to improve, albeit at a lower rate than in the last decades. Common sense dictates that these two things alone must end with an increasing number of people living here, unless some of them leave.

That's without any contribution from immigration, and that was the point I was making. If everything else remains equal, and of course it won't, an increaing number of elderly people and a lower number of young people cannot keep our economy running at the level we have come to rely on. Plugging the gap with immigration is the only realistic answer.

It's not a question of liking or disliking it. It's only a question of realism.

Our world is changing fast and we have no choice other than to change with it. Whilst our mortality improvements will slow, better health care will impact those in the developing world significantly. Combine that with the impacts of climate change and we need to be ready for more change than any of us can imagine.

I would suspect that there could be truth in that. A few weeks ago I had a drink with a pakistani woman from England. She was on holiday in Ireland with friends. She had obviously integrated into 'western' culture. Not sure, however, if she is the norm or the unusual.
The current norm in Ireland is that women from Bangladesh or pakistan say they are from Yemen or Somalia (which they clearly aren't) and carry on their radical Islamic message. I find it ironic since the main reason they're leaving in the first place is radical Islam.