They always have been. There is also a section where they say that locos are available at cover price plus postage, but I must admit I couldn't find that the last time I looked.
>edit<
Found it, it's in the magazine.
Back Issues
Please order through your retailer or write to
Amercom (UK) Ltd Subscription at FREEPOST RSUZ-REJC-YUAH, Great British Locomotives, Unit 4, Pullman Business Park, Pullman Way, Ringwood BH24 iHD
enclosing the cover price payment plus £0.50 for p&p per copy.
(Republic of Ireland, please enclose the cover price plus €1.00).
Please state the name of the publication you are requesting.
That's in all issues up to No 8 (Black 5) - I haven't got a later one to check.