Hi,
I`m a sparky! I live in the Manchester area too.
Got a few different types of crimp connector also.
I`m not too struck on soldering vehicle wiring as can lead to problems if not done properly.
I use www.vehicle-wiring-products.co.uk in Derbyshire.
They sell a range of stuff including the original type Jap bullet connectors & clear insulating covers & the crimp tools also.
Roy.