I repotted my lemon and lime trees today and i enriched the compost (a specialist citrus compost) with bone meal to encourage root growth, however, on further reading on the internet, a number of people suggest that bone meal raises the pH of soil because it contains calcium, while others say that, although it does raise pH, the effect is negligible unless huge quantities are applied. Can anybody advise? Should i re-pot?

It depends on how much bone meal you added. I would suggest next time you use a organic complete citrus fertilizer in the place of the bone meal. Something like Espoma Citrus-tone would be better. A citrus type fertilizer will keep PH lower and supply all needed major, minor and trace elements at correct levels.

It really depends on how much was added but, If I had to answer without knowing I would say repot. I hoped that helped.

Cheers for answering Ryan. I've now repotted them with unadulterated citrus compost (J Arthur Bowers').

Given that they're in fresh compost, when do you reckon it will be necessary to feed them with fertiliser? One of them is heavily in bloom (as yet none open, however).

What is " unadulterated citrus compost" ? I know the word compost has a totally different meaning in the UK, then it has in the USA.- Millet (931-)

Bags of potting mix specially formulated for growing potted citrus are now quite widely available in the UK. They include all the nutrients and trace elements normally recommended for citrus, and usually state that plants do not require further feeding for up to six months. The bags I have seen have been peat based, but I guess that now that the use of peat is becoming 'politically unacceptable' here, other substances will be replacing the peat.
What worries me about these composts (as we tend to call them) is that they seem to ignore the problems of drainage. There are no larger particles such as CHC or bark chips added. For this reason, I have always avoided them. I prefer to mix my own peat with CHC's or chipped bark and some added slow release fertiliser.

Thanks Citrange. I knew that in the UK the word "compost" did not describe the same product that it describes in the USA. In the UK "compost" is nothing more than a retail potting mix, and not an actual aged composted product. I agree with you that a medium that has a consistency of mostly peat moss,is not a good medium for citrus. I also generally prefer to purchase a medium without it being pre-charge with nutritional elements. - Millet (930-)

@Millet

Completely misread your question ! Yes, exactly what citrange said.

@Citrage

I also live in London - where do you purchase your CHC from? I've visited a number of garden centres and pet shops but have been unable to find it anywhere!