Busy re-painting the front door and frame etc and realise it's a bit more rotten than I thought. As per the pics below I've dug out all the
wet rot back to sound timber and have applied wet rot treatment liberally.
I started trying to build up filler, but it's just to big an area to fill and shape any sense. It's also nigh on impossible to fill upwards
into the gap on the inside of the frame.
What's best to do - try and cut back a bit more square and patch some new timber in then fill and paint?
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I would cut through above the rot and replace the timber, bit of paint and filler would be ok for years.
Yep let some good treated timber in and it will be fine.
If it were me id cut it on an angle like this
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And then glue and screw a new piece of timber in jobs a goodun!
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Originally posted by corrado vr6
If it were me id cut it on an angle like this
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And then glue and screw a new piece of timber in jobs a goodun!
Cut at an angle, but the other way to above ^^
Liberally coat the join with good wood glue (such as a polyurethane based one) and screw through both at an angle. Fill and paint.
Sorted for another 50 years 
^^^^ Yep he's right^^^^
will stop the ingress of water in the joint
I'm no chippy but the above logic re the cut angle is sound! 
Thank you chaps - I'll be making a start tonight!
Following the advice I started the repair. Due to the awkward profile of the aluminium sill, the multi piece construction of the wooden frame,
limited skill and tools I decided to cut it square and replace in 3 parts. First part fitted as below, 2nd and 3rd part fitted with pics to follow
when it it's not buried in snow 
repair 1
repair 2
repair 3
Fully glued and screwed to the sound timber and sill, filled and ready to sand for painting. Quite satisfying really, although if I had the cash
available I would pay someone to rip it out and fit a full UPVC frame and door and have done with any further maintainance
Don't know why, but I found this old thread.
Whole door and frame now replaced with a composite door and UPVC frame. Easier to open and close, far less draughty and no rainwater ingress either.
Job done in a day and good results - happy chappy