ToughButterCup

Not a 'given' @Pocster . Not in my case.

Not only a self-builder: but also brave. Hats off well done. Got any goss' about Our Kev and 'is little proclivities - we'll keep it a secret? Honest PS I'll ask it first ------ How The Hell Did You Get Those Stairs signed off ?

The one thing we are not is expert. We encourage everyone to do their own Due Diligence. It would seem from the images that the (lack of ) difference in height between the Inspection Chamber (IC) cover and FFL has a lot to do with the problem. It looks certain that that design is guaranteed to cause problems

Learn patience.

You are in excellent company. The only member here with enough money is @Pocster Talk nicely to him and he'll put a HobNob in the post for you. That should save you a bit.

Pete, that wasn't a joke........

Wimmin. "There you are darlin' ... " says @peteypops with a big (this means Brownie Points) smile and flourish "Errr...." ( she hoists a storm warning - with a matching smile natch) "WhatAboutThe [.....] sweetheart ?" " But you didn't ask for one of those " Foot tapping starts ...... "Well I'd have thought that was obvious ...... "

Well done Sir! Top of the Class. Diplomat of The Year Award. I found that on our house build, everyone, but everyone tries really hard not to talk about anything that smells or could smell if things go wrong.

A reputable Estate Agent will answer that question. And if you ask three of them, and they all agree.....

I asked a similar question in relation to our house. The most sensible reply was (among a wide range of others) treat the area as if it exceeds the threshold anyway. Followed by " In a fire, would you like to be stuck up there just because you'd saved a few quid ?" We don't have to think too far back to what Value Engineering can do in relation to fires and survivability

I never could remember the difference between malapropism and spoonerism. Mangle will have to do for me. Still @SteamyTea and @Pocster will doubtless soon pile in with their take(s) on the matter of how we can make a hash of poor newbie @Fulltopuk's innocence. For me, there are just too many permutations .... I mean just imagine how a proper Lancastrian could mangle the screen name

Welcome. That'll be you and a few hundred other then '...asking more questions than I can answer ....'

@nod has forgotten more about rendering than all of us put together will ever know. But that hasn't stopped me trying to find out about rendering because it's a really interesting thing to do (or in my case mess up). I still know close to SodAll, but I can research Tinternet This guy is really good at explaining the process

Excellent. Interesting design. "... 20 years+ ..." An excellent lesson there for many. Persistence has its rewards.

At this remove, other than offer generalisations, we can't help. I'd plan on removing the tank and replacing it with a treatment plant. Either now or at some point in the future . DIY about £6k, otherwise £10k. Choose the system with the least moving parts. That type uses an air blower(s).