Deep breath, here we go with someone else that simply doesn't read the posting guidelines!

Ok, I'll fill in the missing pieces!    

Tell me if I am wrong before we all go searching on your behalf please!!!

www.constructionplanetdirect.co.uk

opens showing two depots.  Seems you want South East as you want West Sussex?  

0870 2255566 is the ngn that the alternative is being searched for.

According to 192.com, the address is
STAR ROAD
PARTRIDGE GREEN HORSHAM WEST SUSSEX
RH138RA

Now assuming all this information is correct (please let us know for sure), we can start searching for the alternative number.

Glad to have done the initial donkey work for you!  



Looking further into their website and having clicked the South East depot link , they have contact details, showing a general number of 01403 710969

Begs the question, 'Did you not look at their website at all?'

Please come back and let us know whether this number is the correct number as an alternative to 0870 2255566.