When I was trialing a lot with my series I had those flanges that had a screw fitting in them and replaced with grease nipples. After a dirty day fresh grease pumped in. If there was water in there don't know where it went but never had to replace a bearing.

Do you drive through over axle deep water a lot? Although a 1990 truck mine is a late made 19j with the old axle lube system. Has 200tdi engine these days.

Yes Just EP80/90 oil to fill swivels. Some say use grease is they leak some on the ball housing to reduce the issue. Thing is when heated while driving the type of grease in one shot gets just as runny as oil. It is best to fix the seal. Bush is a Bronze alloy and an available part

My daughter tells me there are adaption kits available to allow Isofox seats to fit older models.

A quick fix is a couple of Jubilee clips around top spring coil and seat housing.

And it is correct for pre Defender models @lynall :D

What you are thinking is all wrong. What you are describing is how the set up should be for Land Rover Ninety and One Ten models. The "Defender did not come in until late 1990. [this distinction can be important when ordering parts] I have a pre Defender 1990 Ninety that has the same axle...

Doubt you fried it but you could have jammed it in gear. Try putting it in gear say 3rd high with ignition off and rock the truck back and fore. Given it's a Landy you may need a couple of mates to help do this.

There are "spot weld" removal drill bits available.

Plenty of older vehicles around here. Had a look at an electric job the other day, just an electric servo motor pulling on cables. Another thing to go wrong so folk do not learn how to hill start using the hand brake!:(:(

Like wheel bearings

Yes go from the seat box center plate. Clean and a tad of lube may do it. Could be ratchet itself worn or the pawl that catches in it has gone/worn. When learning to drive a long time ago I was taught to pull brake up with thumb on button and then release. Today one hears many just "rasping"...

Having a partially seized UJ in the steering results in a knotchy feel when you turn the steering, bit scary when it starts when driving at speed.[ I know that] The force to move the swivel [ in my old manual a fishing scale is used pulling on the hole where the track rod goes] is noted as 12lbf...

Have in recent times had little grandchildren to transport I have to say that todays child/baby seats are rather large when compered to plastic bucket baby one of 35 years ago. Modern cars have a built in system to lock in child seats so you will need a type that can also be fitted using the...

Swivel pin load and steering joints it is then, good luck.

The axle ones I mean.

A dead or nearly dead shock/damper can result in that sort of rattle upon hitting a pot hole but pre load first.

Fix the other side, new top pin and bush if there is any side to side movement at the top of the swivel housing. In this case just removing shims will only improve things for a bit.

Get a proper bumper, that box section looks horrible.

Endoscope attachment for I phone and look through the slave as per @D1Nut post. Mine's arm went at 69K [ I keep a record of major repair/service items] It would depend on where you live, driving with me is mostly up hill and down the cwm on back roads so lots of changes.