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Cheers. This? https://www.repair-care.co.uk/products/dry-flex-4
It's one tiny window by the front door. Bone dry now but I want to get it done before winter - the epoxy resin system looks pretty good googling around, but there isn't much in the house that hasn't been uPVCd, so possibly a little pricey. Do you have to go with the whole system including their own prep/hardener? Think I will pay a visit to Brewers anyway, looks like they stock it. Timbabuild looks online only.
Search for repaircare. Epoxy resin system that is the way most pros are doing it now. In the past I've used a product called decor fill with some success, just been cutting out some 10 year old repairs in Decorfill, had a about a 20% failure rate mostly around knots. Definitely cut out all the soft damaged wood and dry the area, then optionally use a liquid that seeps into the fibres of the wood and hardens them before filling. Toupret ready mixed wood filler is also very good but it doesn't dry quickly if you are filling deep holes.
The epoxy resin option is expensive for one off use, I probably spend £300 a year on it as it saves time is easier to work with and lasts longer. I have the advantage of doing several window projects a year though. There's a slightly cheaper system called Timbabuild but it's not as easy to work with.