Looks good Ben! You're really into the bbq/grilling thing. Nice!
We have two main grills -- a 13 year old Weber Genesis grill that runs off the natural gas line to the house (no propane tanks to fill!); and a ceramic charcoal smoker grill (similar to the Big Green Egg, if you're familiar). The latter is a Japanese kamado design and is a really fantastic thing. We use it for smoking, slow roasting, and occasional high temp grilling.
The Weber is our daily driver - it sits (along with the Kamado) on a small side deck right off the kitchen, literally four steps away from the kitchen stove. We can have stuff going on the stove and grill at the same time, and it becomes just an extension of the kitchen.
We grill rain or shine and all winter long...just shovel the snow off the deck and we're in business.
Also, when we want a really good steak I pull out a little Weber Smoky Joe portable charcoal grill. It puts the meat within inches of the glowing coals and gives a perfect sear...nothing like it when we have a nice ribeye or T-bone on the menu.
If you want a single replacement for your Weber smoker and pizza oven and kettle grill, then take a serious look at a good ceramic Kamado like the Big Green Egg (if they're available over there). They can do it all. I dare say smoking and slow roasting is probably easier than in your Weber - once it comes up to temp and the vents are set, then it will hold steady all day with no fussing, with maybe only one quick intervention to rake the coals and maybe add a few more. The walls are 1-1/4 inch thick ceramic and really retain the heat. They are fantastic. Highly recommended.
Svend
Edit: the Egg is indeed sold in the UK:
https://www.biggreenegg.co.uk