Onoff

Just get a cordless hairdryer. Simples!

Main thing is to do something and not sit on the fence...

When the wall does fall down they'll hit you with pictures taken from said window and say that your plant (digger, dumper, whatever), caused it.

What's that dog's hind leg then?

I meant a bead of mastic as in silicone out of a tube. Do it properly, as in take the glued on beading off internally or hack the reveals off to expose the damn great gaps. Your experience sounds similar to mine! I reckon the old wooden windows were less leaky! 😂

Sorry, didn't mean to foam/silicone the gap where the sill meets the window! This is a good shot, one of mine before it went in. See the hole in the bottom of the window? Any water in the frame comes out there and runs off the sill. However...your gap looks excessive, like the sill isn't tight to the frame. I run a bead of silicone between the sill upstanding on the right and back of the window frame and screw the sill up into the frame.

Whilst "double glazing" was seen as the panacea to all cold evils, installers were often just scammers keen to maximise profit. New windows would be deliberately undersized to to allow quick fitting with no hassle. The subsequent gaps were often not filled but covered with trim. Sills were "glued" on with mastic etc. The TV series White Gold was closer to the truth than you can imagine. Those gaps...fill them as best as you can. I'd mask the window with tape and where you can, inject Illbrück FM330 using a proper applicator gun. When set, cut off level with the window using a sharp craft knife. Keep the windows shut whilst it's setting. Then add mastic beads all around. A Fugi Cramer tool set will help with the mastic beads. Unless you want to hack back the reveals inside and see just what atrocious gaps they've left and really do it properly. I kid you not I have 1" gaps around mine.

They can be at the mixer like this: From memory I have them at the pump connections too.

Any little gauze filters that are blocked?

It could be an entire season of Abandoned Engineering! "Who built this and why didn't they finish it?"

All episodes / seasons.

You could fill with yellow grout?

Is the gap at the bottom higher than one of those subway style wall tiles? It looks it from the first picture. If the gap is higher then what clearance would you have if you were to put a row of tiles at the bottom? You don't really want a "huge" gap there. The bottom row of tile's height should be a bit less than a tile's height allowing each one to be trimmed to suit the floor as aforementioned above, with a 1mm gap between bottom tile and floor. The suggestion to have a plinth makes me wonder if the tiles were started too high.

I'd say if it sticks out it's a plinth. Ledges hold water, collect dust, mould etc.

You leave the gap at the bottom slightly less than a tiles height. (I screwed up btw, should have had a full tile at the bottom then wouldn't have needed those silly rips up at the ceiling): You then place the bottom tile where it's going but flipped on its long edge. Mark the cut line. Cut to that line less any spacer width. When you flip the right way it should fit perfectly with a nominal 1mm gap at the bottom. You cut the bottom tile like this to accommodate any undulations with the floor. Once stuck on remove the (yellow) packs. Force clear CT1 into the 1mm gap and baby wipe off. Finish with a bead of silicone you can replace when it gets grubby. My tiling is sh!t but I know the concept.

Total bolloques!

Just build a new whatever. If they look from the air they'll see that it appears you've re-roofed the building that was already there.

Rebuild it to look like a 40' shipping container!

Likely tidier than the inside of my house. There's a couple on here who could attest to that

Needs tat to make it homely imho. Just shout if you need acres of poor quality shelving adorned with knick-knacks, covered in a layer of dust. Ditto ornaments that can't be gotten rid of because so and so bought it for Mum 60 years ago. That and her ever growing collection of cardboard boxes... 😉

Bee Gees?

I was more worried about any cleaner affecting the heat exchanger in the boiler which may be aluminium? Apparently BG once did a "power cleanse". This is where they close all the rads and run the flushing rig just on the flow & return pipework. Different so they say to a "power flush" that does the pipes and each rad. Sounds complete BS to me. I'm not getting involved I've decided.

How easy is it to power flush the CH pipework connected to a modern gas combi / condensing boiler? I can get the rig from work and have successfully done my own oil boiler / single pipe CH system. Got to be honest, anything gas boiler related scares me. BG want £900 or a Local Heroes guy £700. Cheers.

Simple Jack, remember him @pocster, big lad?

You do know you can get plugs from specialist shops?