The signs are 13.2 metres (or just under 14 1/2 yards) from the give-way line at the junction. Yes, it would have been better to have had something on the junction itself, but they aren't obliged to put them, just to follow LATOR Regulation 18
https://www.legislation.gov.uk/uksi/1996/2489/regulation/18The signs for a restriction must be "adequate", a typical get-out in legislation, because it is subjective. To you. the signs placement is inadequate, but an adjudicator could well decide they
are adequate.