Welcome.
A little more information on the company/organisation/gov department, etc helps us a lot when trying to look for alternatives. Things like address, website address, geographical fax number, etc as mentioned
here and in red when posting.
Fortunately, I was able to find
www.nhsstudentgrants.co.uk.
As you mention the number 01253 655655 now asks you to ring their 0845 number but I tried numbers from 01253 655656 all way upto around 01253 655 688 but all were engaged. Now this was just now and earlier on this morning which is extremely unlikely to be busy at these times therefore the reason is most likely that the call centre staff have put their telephone equipment to 'Busy/Not available' this stops calls getting to them and ringing the 0845 confirmed they were closed.
Therefore, I'd recommend trying numbers from 01253 655
656 to 01253 655
688 first thing on Monday morning (if possible) or another time when they are likely to be open and ideally not busy.
I couldn't find any true geographical alternative but apart from the above I did notice they use a geographical fax number of 01253 774490.
Therefore, if the above numbers are always engaged then you also try ringing some numbers in the neighbourhood of 01253 774490 (eg. 01253 774491, 01253 774495, 01253 774480, etc).
In the meantime over the next few days I shall request their geographical number under the Freedom of Information (FOI) Act (assuming they come under the FOI act which they should do if they're government funded). This unfortunately may take around a month for them to process and (hopefully) provide me with the geographical alternative but could be lot less or even longer in some cases if they start being funny, etc. If I do get their geographical this will be added to the database.
Good luck and let us know how you get on with the above numbers.