I have just received a Classic Army MP5A3 from Gunfire.com.
Product value:£136.99
Shipping costs:£20.73
Total:£157.72
Plus customs charges of £42.67
Cheaper than buying one in the UK, plus nobody has them in stock anyway. Gunfire has a minimum order value to the UK of £135 for the exact reasons stated above, they've stopped using UPS and moved over to GLS because they're less of a shower of shit. Shipment was prompt, the only real delay was in GLS telling Parcelforce what the customs value was so they could charge me.