Anychance you can get a pair of these that sit flush with the bodywork?

Side repeaters must be seen within a certain angle so flush might be difficult:

http://www.legislation.gov.uk/uksi/1989/1796/schedule/7/made

 

3. Angles of visibility–

(a) A motor vehicle first used on or after 1st April 1986 and a trailer manufactured on or after 1st October 1985–

(i)

Horizontal (see diagrams in Part III of this Schedule)–

(A)

A front or rear indicator fitted to a motor vehicle, other than a solo motor bicycle or a motor bicycle combination, having a maximum speed exceeding 25 mph and every rear indicator fitted to a trailer:

.80° outwards and 45° inwards

(B)

A front or rear indicator fitted to a solo motor bicycle or a motor bicycle combination:

.80° outwards and 20° inwards

©

A front or rear indicator fitted to a motor vehicle, other than a solo motor bicycle or a motor bicycle combination, having a maximum speed not exceeding 25 mph:

.80° outwards and 3° inwards

(D)

A side repeater indicator fitted to a motor vehicle or a trailer:

.Between rearward angles of 5° outboard and 60° outboard or, in the case of a motor vehicle having a maximum speed not exceeding 25 mph where it is impracticable to comply with the 5° angle, this may be replaced by 10°.

(there are vertical requirements also.)

You could get round that by fitting some in the wing mirrors.

 

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