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Everything that airhead says is good advice but I'd be concerned that you may have a couple more issues than just the panel.
In the photo below I have highlighted, in red, what looks to be rot at the bottom of the door where the rail and style meet. Also highlighted in blue is some bubbling of paint along this joint (this could be natural movement but given the rot at the bottom it could be spreading) as well as the swollen area highlighted in purple it all paints a worrying picture that the tenon that holds that corner of the door together could be rotting or worse.
Out of curiosity has the door started to stick recently? The margin at the bottom looks very tight, this CAN be an issue as water that gets past the rebate at the base of the frame can sit against the door and "wick" up it causing all sorts of issues. These issues can be fixed but it's a delicate "surgery". The best way to find out is to put a mirror on the floor under the door when it's open and to check for signs of rot. If you see anything give it a poke to see how soft it is. Also check the end of the tenon to see if that's spongy.
As far as the panel goes I'd be tempted to replace it. There will already be rot along the bottom edge of it that could well have penetrated up the panel and may cause issues with the rail on the bottom. By putting timbabuild or repair care on it you are dealing in moisture when it needs to dry! Replacing the panel will not be easy but it is doable.
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Bobbo
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The door does stick a fair bit after periods of heavy rain. When I stripped it and re-painted a couple of years ago, the bottom of that side of the frame had completely rotted. I used a wire brush to get rid of the loose material, then fixed it and built it up back to a door shape with epoxy filler. Clearly only a temporary fix. The door and fame are massively exposed to the elements, and we have a flat roof above it that drains off in that area, which is the root cause of the issue. I had to do a similar bodge on the bottom of the panels covering the frames and the sill (see before and after photos from last time) although I did let in some new pieces rather than use filler for everything. The sill has now completely rotted again. It sits directly on top of the flagstones with no membrane underneath it. It needs to be completely replaced to be honest.
Sharkstar
Brilliant. Thanks for the advice. I’ll check out Sealants Online.