Finally, some free time to carry on with the Wickham trolley.
The obvious next job was to fit the roof. This involves soldering brass to whitmetal. When I fitted the handrails, I had to tin them with normal solder before attaching with low-melt. This time I've bought some more 100 degree, to replace the pack I've mislaid, from C&L.
For a while, the roof has been kicking around but when I come to fit it, it's disappeared. Probably to the same place as the old solder.
Not to worry, a new rectangle of thin brass was carefully cut out and then curved in the rollers.
Then a few blobs of Powerflow flux and a bit of soldering iron work and it's in place. I use the normal iron for this although the low temp one will work. If you are quick, the brass acts as enough of a heat sink to avoid damaging the whitemetal bits, and these are big enough to survie a bit of heat.
While I was at it, the front bumper bar (if this was a Volkswagem we'd call it a "nerf" bar) was made from some nickel silver strip and brass rod. It's done by eye but looks OK to me and is an essential feature of a Wickham.