2 showers, both going cold together

Hi, my daughter lives in a flat (5th floor) which has an electric shower (Triton Jade 2) in en suite, and a Bristan B85 over bath in main bathroom. Both installed in 2007.
Both work well although Bristan has always had the low pressure light permanently on - must have been like that when fitted but never noticed at time.
Over last couple of months, daughter gets half way through shower with Jade2 when it goes cold. Goes to Bristan and its the same. Both have normal flows and all other taps, (hot and cold) work normally. Indefinite time later, both work normally. She's not sure if Jade2 low pressure light comes on when it goes cold - forgets to look when getting cold water over her! This is happening weekly, at weekends and evenings. Could be also during day but she's at work Mon-Fri.
Assume low pressure somewhere in building although it seems no other flat has complained to factor. Needle in haystack to trace, I guess, but any ideas would be a great help.

Well on the fifth floor she is lucky to get any mains water at all.

Presumably needs a mains water pressure booster pump.

These can only be sized to give 12 li/min so would only just let both showers run together!

May need a piumber to assess the supply as it may not be mains provided.

Plumbing is not necessarily as simple as some expect based on plumbers being thick and leaving school at 15. Some even have degrees now!

Tony

Thanks for reply. However, flat is in central Glasgow, building has 6 floors and 40 odd flats and pressure has been good with us for years and as far as I know, everybody else. So don't really think a mains booster is suddenly needed now.
Certainly have never thought plumbing is easy. I can't do it. Not sure why you mentioned that.

We don't know how the water is provided.

It may be pumped already, have a tank on the roof or possibly be mains water powered.

If the latter then the water supply co may have reduced supply pressure.

I don't know and a good plumber could inspect and identify and measure pressures!

Tony

Plumbing is not necessarily as simple as some expect based on plumbers being thick and leaving school at 15. Some even have degrees now!

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Some of us even run our own firms, you patronising little person.