Thanks, gents. I have put both on my birthday list

What I don't get, I will buy later.
I am looking forward to getting that 8F - it looks magic. The N2 is likely to be a more useful everyday loco. How much extra weight is considered sufficient? I recently acquired a few square metres of lead sheeting which is currently improving running on my layout.
Interesting: 7-8 Bachmann mk. 1s - we currently pull six Hornby coaches with the A4 Pacific, with added weight in the tender. Much more than that and it starts to slip. What would be considered normal?