Diversification of company

[s2t]

I set up a company several years ago for management consultancy in a specific field which was quite successful and currently have a reasonable sum of cash in bank. For several reasons may not return to that but fancy doing something completely different which will need a capital outlay of say £20k.
Can I embark on this new venture under the same company name and use the funds accordingly. I am pretty sure the company business description at the outset was almost all encompassing but the audited accounts too date have described the business as the management consultancy
I have written to accountant but think he must be on holiday so just wondered if there is anything formal I need to do