A deposit and then clearing the balance would just be two payments on the same invoice though. People obviously do a £1000 voucher and top up the rest all the time, but it wouldn't involve multiple invoices. Things may have changed since I was last working for Evans (5 years ish) or any bike shop (4 years ish) but I don't see a way that they could do this.
This. Also, any sensible shop/manager will balk at the idea of a person in the UK paying in EUR, especially when you put multiple invoices into the mix; it seems fishy regardless of how kosher it may be.
A deposit and then clearing the balance would just be two payments on the same invoice though. People obviously do a £1000 voucher and top up the rest all the time, but it wouldn't involve multiple invoices. Things may have changed since I was last working for Evans (5 years ish) or any bike shop (4 years ish) but I don't see a way that they could do this.