Graham Farish makes A1 and A2 Pacifics.... http://www.bachmann.co.uk/prod1.php?prod_selected=farish&prod=2
Dapol
You can get one from Hatton's.
http://www.ehattons.com/58983/Dapol_ND128G_Class_A4_steam_locomotive_60005_Sir_Charles_Newton_in_BR_lined_green_with_late_c/StockDetail.aspx_and_double_ch/StockDetail.aspx
Andre
Even though I'm a Pennsy modeler, I've always been a fan of the Flying Scotsman and the London & Northeastern Railway's A4 Pacifics. Does anybody make a decent model of these in N Scale?
Also, the prototype Scotsman was brought to the US in the 1970s. Did it ever go around Horseshoe Curve?
Modeling the Pennsylvania Railroad in N Scale.
www.prr-nscale.blogspot.com