its not a hard job to DIY,theres used to be a kit available for the rears,new seals etc(3off iirc) made by lucas.my local parts place had them on the shelf.
tricky getting the main seal to sit propley as you wind it back in.
 
I got a tin of red caliper paint from halfords recently for about £10. Looks good, not sure what the longevity will be like, but it can't be any worse than standard. Just make sure you clean & remove any flacky paint very well before you paint them.
 
I've hered they can be revived with red t-cut i think i'll try it before a respray.