Active job

Garage spouting/leaking inside estimate please

We have a double garage that has badly built spouting on the right side. The spouting sits on the inside of the garage and either due to a shift or just bad workmanship it overflows and leaks inside in about 4 different places (this isnt helped by the fact the spouting doesnt slope like it should and water sits in it). These are just drips but was 10 litres worth overnight last night. We need this spouting fixed or replaced so that the inside is water free and the spouting drains as it should. There is also water damage to the inside gib boards but Im not convince they have any use anyway. Will need advice on this and advice on whether we need to replace any water damaged rafters etc. Sorry forgot to take photos last night...will take some tonight (written on hand :-) ). The response to this quote request has been amazing so very sorry if you don't get the "contact allowed". Photo edit: the first three photos show that there is slow leaks at the joins but this isn't the main problem... when it pours (Monday night) the angle of the spouting means it doesn't drain right (even with leaves removed) and so it fills up. The last photo shows the outside wall and why it overflows inside rather than outside. The first photo shows a piece of beading I placed to elevate the spouting to slow the overflow. This seems to have worked somewhat at this point but now we have more water coming through at photo 3. So basically we need a way of sealing (or replacing), increasing normal drainage and stopping any overflow coming inside. I also need professional advice on whether the wood in photo 1 (horizontal) needs replacing. (Yes that is Selleys no more gaps and yes I knew it's not for wet areas but on Monday night it was all I had so I thought why not.)