As above re boiler size I'd want to look at heat loss calculations.
They both seem to be offering what would be regarded a a fairly standard S plan system.
I would at least look a better controls and a boiler capable of hot water priority that could keep boiler in condensing mode most...
Just spoke to my sister (she's a Dr of horticultural and lectures for R H S)
She recommended looking at R H S website they have several pages on box moth .
Also a reporting form that is helping keep track of the spread.
We have quite a few box plants (play around with topiary)
Have had caterpillars in past mostly cleared up by local flock of sparrows!
To my surprise other day saw sparrows on aquilegia flowers turned out they were clearing a greenfly infestation.
More a case of identifying tap make.
If you have no paperwork that came with tap send a clear picture of tap to tapsparesuk or similar company get it identified and then order spares.
A lot of this type of hose is tap/maker specific.
You can use a compression tee or a push fit correct pipe inserts required with either option.
Picture of said bidet would be useful some require pipework to be done a very specific way.
yes stop worrying!
I've been doing this God forsaken job over 50 years live in a rural area with lots of off mains drainage and have never seen the problem you envisage.
Long since swapped on to using E P H motorised valves/controls
Decent price and 5 year warranty rather than the 12 months offered by honeywell drayton danfoss ect.
Having said that never yet changed a E P H zone valve
See way more wiring problems with Y plan than anything else.
Almost seems to be standard to use 3 core for cylinder stat and not mark green and yellow as a carrier.
For the fairly minimal cost of another zone valve in real terms could never see point in doing Y plan.
Saw him probably last time he toured uk around 2011.
He did several nights at a music pub in Sheffield
Great night was brought over and apparently stayed with Richard Hawley who was a big fan.
I live/work in a area that has water that is described as aggressively hard.
Regularly fit water softeners we use East Midlands Water Company really good range of softeners.
They are happy to advise on your requirements.
We normally use there own branded ones have quite a number fitted never...
That's a thermostatic rad valve minus head
The cap you have is intended for what you want to do!
I would first make sure the pin moves up and down then screw down cap tight .
Remove rad with some caution valves sometimes don't hold.