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Strippers of Sudbury is the firm with really helpful advice.

A 16mm gap will be about as good as a 20mm gap. With larger gaps convection within the unit reduces insulation effect. Most smaller makers of units can't use soft coat low e as it takes specialised equipment to handle but your local suppier should be able to get soft coat units for you - if...

The Building Regulations do not require trickle vents - only that the building be adequately ventilated. Trickle vents are just one means of achieving this. You have to decide whether you want them, and if not, what alternative means of ventilation is provided.

Timber is not a very good insulator, and of course it depends how thick the panels are, so it may be worse than U=4

Make sure you have good fitting heavy foam draught excluders on the door. Sound is rather good at 'leaking' through thin gaps.

A double glazed unit might be made of a sheet of patterned glass with a smooth and a flat side and a sheet of clear glass with a low-e coating on one side. In which case the surface from the outside counting inwards should go: 1 Smooth face of obscured glass 2 Rough face of obscured glass 3...

Cherry picker would be half that cost. Please don't die.

Relax. Oak doors and window frames will manage just fine after all the old cracking and peeling varnish has dropped off. The timber will then be free to get on with the natural process of fading to a venerable silvery grey colour, darker at the bottom where it gets more rain, paler in the...

No, the window above a door is not classed as a 'critical location' according to the diagram in Building Regs Part N. You're not intending to put the basketball net above the door?

That's probably an urban myth. The other glass myth is that, being liquid, it slowly sinks, which is why old windows are thicker at the bottom than the top. Not true.

Maybe. I'm often frustrated at how persistant the label marks are. They even survive wiping with meths sometimes.

No it's not right. Anyone can make and install a window. But. You do have to comply with the Buildings Regulastions, particularly regarding insulation (Part-L) and emergency escape and safety glass in some cases. You should tell your Local Authority's Buildings Control Officer. He will come...

You should be able to get that much new 'green' oak for under £100. It weathers to a silvery grey quite quickly if you don't treat it with anything.

Best to go to a small joiner. If you can't find one locally get in touch with me and I'll make one for you. I'd do it in oak (of course) and the frame could be quite slim - much less than 7" ++++++++++++++ Sorry Biff - Advertising and email. Suggest he looks at your Profile. Mod...

I don't think you can read too much into the writing on the label on the spacer in your units. It's pretty arbitrary which way up they go when the unit is put together. The installers probably got it right but I did notice a new build a few months ago where ALL the windows had their stickers...

Have you ever noticed your car windscreen has mist on the outside in the morning? Same process. Radiative cooling of glass to below ambient dew point. More common in an unheated room/garage/car on a damp morning after warm rain the night before - like yesterday.

No, but the supplier may not charge you by the square metre for very small units.

Oh don't replace with PVC. Whatever you do with painting the wooden window it will be better than plastic. All the good advice you've been given is just searching for perfection. Second best is still far better the PVC.

Not if you are 'competant'. But this is a low pressure water job actually :)

Thanks again.