This could have helped

Memory4mobiles.co.uk
27 Old Glouster St            (This spelling is from their own site)
LONDON
WC1 3XX

But maybe not, as there are about 150 companies registered there.
It looks like an address you would get when buying a premade company from an "Exchange & Mart" ad.
They are not there.
It is not their address.
Are they worth your trust?

From Whois
Domain name
    memory4mobiles.co.uk

Registrant
    jonathan ruff

Registrant type
    UK Sole Trader

Registrant's address
    Memory4mobiles.co.uk, 27 Old Glouster St , london
    LONDON
    Greater London
    BL1 4PT
    United Kingdom

The postcode is for INVERLAEL AVENUE, Bolton

J Ruff, possibly not his name also owns memory4mobiles.com

Whois lookup for memory4mobiles.com

Registrant
    jonathan ruff
    30 cromwell way
    penwortham
    preston, lancashire PR1 9SB

Looks like it's a new estate, it's on Google maps, but not Autoroute 2006
Domain name:MEMORY4MOBILES.COM

Administrative Contact
    ruff, jonathan jruff@hotmail.co.uk
    30 cromwell way
    penwortham
    preston, lancashire PR1 9SB
    GB
    +44.8452026500

192 confirms that his name is Jonathan P Ruff, and both he and partner live in PR1 9SB

A previous address in UK Info, using his name gives the details
Mr,Ruff,Jonathan,,,,,5,,Finney Park Drive,,,PR2 1QZ,Lea,Preston,
192 still has a listing for there, long with a directors report. They might still be using that address.
Not a lot of other info available just yet.

A Google of the 0845 number AVNM has found in the .com whois with spaces in various places returns quite a few results. Have a look at 08452026500, "0845 2026500" and "0845 202 6500".

Most/all refer to www.memorybits.co.uk who's address is given on the website as:

MEMORYBITS
115 TOWNGATE
LEYLAND
LANCASHIRE
PR25 2LQ

Whois memorybits.co.uk shows it registered at the Cromwell Way address, with no name given as the registrant, just "memorybits.co.uk".

192.com lists Memory Bits with 0845 phone and fax numbers. Its address is given as:

MEMORY BITS
A 135 TOWNGATE
LEYLAND
PR25 2LH

Googling "memory bits" 01772 yields nothing apart from the 0845 number.

Re. the above, many thanks for your help, the situation has been resolved. In future I won't be using this company. Thanks again, vox-haul.