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Was able to send it as a zipped file, so just open it up

Unfortunately I cannot post a excel file on here but anyone interested can build their own spreadsheet from the screenshot, then just change the values in yellow to suit their own requirements.

The Baxi has its return R on the top left, outer, with the Flow F immediately to its right. The logic is somewhat similar but the Return is on the Top, extreme Left and the Flow on the Top, extreme Right?.

Can't obviously speak for @Madrab but IMO the EV diaphragm should never bottom out, this is why a precharge pressure 0.2bar less than the PRV (pressure reducing valve) set pressure, usually, 3.0bar, is recommended, some say it also helps to prevent water hammer as the EV acts like a spring to...

A stainless steel UV cylinder with its pressure reducing valve set to 3.0bar (with a recommended precharge of 2.8bar) and a EV sized to 10% of the UV cylinder's capacity will have a final pressure of just over 4.0bar if fully heated from 5C to 65C, its expansion relief valve might be typically...

Try putting the shower to fully cold and on full. See does that improve the other two.

Yes, but does it feel like 60C just leaving the boiler, does the boiler display the DHW temperature, I'm thinking that there might be some X over from a cold supply somewhere because if its leaving the boiler at 60C or so and its only lukewarm in the kitchen/shower then there must be some cold...

Does the HW pipe at the Boiler only feel as warm as the temperature in the kitchen and at the shower,, what is the temperature set to?

A photo of the Immersion top with its cover removed would be invaluable.

The stat should be the same or almost the same length as the element, its then measuring the average temperature of the water in the cylinder. When starting with a fully cold cylinder then the stat will shut off the power when all the vol of water that the element is immersed in is heated to...

Is the immersion mounted in the top of of the cylinder and if so is it twin element with Sink/Bath c/o switch or is it a side mounted immersion element?.

OK, thanks, can you still carry out one shower vs the other test as suggested above, ie, ensure both flow rates the same and measure/compare the temperatures of both.

Strange that the engineer changed the PHEX in view that d/stairs OK but u/stairs not, presume he took a flowtest at least first.

There are a few basic things you can do. Put the upstairs shower to fully hot & fully open, hold a container under it for exactly 30 secs, measure this with a 1 litre container, X 2 to give the flowrate in LPM, if you have a household thermometer measure the shower temperature, the (my) present...

I know someone who installed them a few years ago and were very pleased with them but installed them instead of oil fired heating, not to supplement it. Dimplex Quantum speak in italics. "The storage heater comes in four sizes: QM070,QM100,QM125&QM1.50.which are respectively...

You may now get a lot of boiler cycling as its minimum output is ~ 8.5kW.

My AWACS system must be down but didn't see your post until a hour ago, however..... Obviously the ABV will distort things somewhat but it might seem that the HEX may not be that blocked up but of course could still have some very hard insulating type of scale build up, what is really amazing...

When/if doing the above tests, can you please take one set of readings with pump speed set to 100% and another test with a pump map settings of 6, 400mb.

Yes, Renew the ABV before doing anything else. That appears to be a 7M (700mb) pump, Pump head is proportional to speed squared so pump head at 50% modulation = 700*0.5^2, 175mb and pump head at 63% modulation = 700*0.63^2, 278mb (2.78M), nowhere near index 6 on the ABV. You might also, for...

A oil fired boiler will allways take longer to heat up than a gas boiler with the same output because the boiler HEX contains ~ 20L of water vs a gas boiler's 2 or 3L.