Mr Punter

This arrangement happens all the time in England. Conditional Contract or Option Agreement are the standard means. With a conditional contract, you exchange contracts at an agreed price subject to, in your case, obtaining planning consent for erection of a new dwelling etc. There will be other constraints to cover time allowed, appeals, fencing and boundaries, access, working times etc. Once the conditions have been met you are obliged to complete the purchase.

Unless you have someone in mind to take on the second plot, just offer for the one you like best. Major hassle and risk once you step outside the self builder role.

It only seems to add water to bagged mix. If it could properly mix the dry ingredients (gravel, sand, cement, admix etc.) it would be worthwhile, so you could make concrete, screed, render, mortar etc.

True but the AC could be over 10x the MVHR

Go back to the supplier/installer and ask for this. It could be a tag or EN number.

Do the MVHR and just put AC in the rooms that need it. If you have lots of PV on the roof the AC will cost nothing to run during the day.

You could suggest that you will make an official complaint. Your LA should have a complaints procedure.

Who has done your inspections to date? If you have a name it would help. Give him a call. Bear in mind it is the end of Easter hols today, so next week should be better. Unless they are no longer doing Building Control (which they are legally bound to carry out) you should be able to get someone out fairly soon. Be nice and don't lose your rag.

There will be loads of solar install firms who work near you. Get 3 quotes and pick one. It may be that they will not fit used kit or have wiring by others but you can ask.

That will be quite a few holes in the web of the existing beam. Have you worked out how you are going to fix the decking?

I think similar or more expensive, depending on the range. Roseview are based on standard upvc profiles from Rehau and do lots of extra customisation and finishing. Their top range is almost indistinguishable from timber.

I have used the "Rose" range in a couple of properties. They are pretty good lookilikies for trad timber.

Hopefully Tim can recommend other trades. It often works like that.

Not sure what the blocks are, but it may be best to render over these. You may need to prep by cleaning off dust and giving a coat of rend aid.

Just fit a mushroom vent to the pipe.