wrote

How much should I be paying for a decent tube of silicone to seal
around basin and bath?
Screwfix have tubes ranging in price from 2 pounds to over 8 pounds.
At the top end of this price range are you paying for the "label"?
What brand do people in the trade use?


As others have said (or implied) you get what you pay for here possibly more
than most places.
Dow Corning 785 has its followers on this group and I am one of them.
Re-furbished bathroom in 2004, sealer shows no signs of deterioration or
discolouring let alone mould.
This is at the upper end of your price range - upto £7 if memory serves!
Worth ringing round though, ISTR getting the stuff for £3 not that long
ago - may have been mislabelled!!!
Check use by date before purchase - shelf life about a year.

However, to avoid mould you should also have good heating and ventilation,
particularly in this weather.

Phil