I second Brookhouse for parts - Simon really knows his stuff and seems to have virtually everything in stock.
Indicator unit is available new, not especially cheap but not too silly. I have some spare lenses, trims etc kicking around, but only shot bulb holder / reflector units (worth buying new as they are always bad & just £20 for the new one)
Chrome strip - might have one somewhere (probably in my father's barn in Devon though), but iirc only £30 or so new.
Lights - generic Wipac etc 7" halogens all fit fine - between £30 to £45 a pair. Ebay, mini specialist, or somewhere like
http://www.s-v-c.co.uk/
How totalled is the wing? Wondering if it would be any good for donor sections to repair a rusty wing, which would save a lot of money assuming you can do the work yourself.