I am looking for an alternative for the above company listed as,
                             
                    0871 855 2425
                       Thanks

A google for the phone number throws up an email address and fax number:
RepairTech - 0871 855 2425
Fax:               01926 810052
Email:            hannsg@repairtech.co.uk

So this appears to relate to a contact number for warranty repairs for the Hanns-g range, not for Hanns-g themselves.

Repairtech's website shows
Tel: 00 44 (0)844 482 11 55
Fax: 00 44 (0)844 482 11 66

Which, aside from being totally wrong and actually un-dialable from abroad, at lease gives you a marginally cheaper number to get hold of them on within the UK.

There is also an unverified number for repairtech in the database of: 01926 810030

I suggest you try that one, and do come back and let us know if it works!