You are in the classic nightmare situation of a small business with very low VAT inputs offering services to the general public. Stepping over the VAT registration threshold can literally cost the business upwards of £150 per week, in addition to the extra administration work involved.
Once you register for VAT, you have to charge VAT on all your sales invoices. This means that you either have to add 20% to all the prices your customers pay, absorb the VAT into your existing pricing structure, or do a bit of each resulting in your customers paying say 10% more and you absorbing the rest.
Adding 20% VAT to the prices currently charged is generally commercial suicide. Would your customers happily pay an extra 20% for exactly the same service? Of course not - if they would, you'd be charging that already!
Absorbing the VAT into your current prices is in effect a direct revenue cut of 16.7%. On a turnover of £70k this is a cost to you of nearly £12k per year. Ouch!

Your very low level of inputs means that pretty much all you can claim back is the VAT on your petrol receipts!
So what to do?
Many on this forum will tell you that you must take it on the chin and register for VAT. Your turnover has exceeded the registration theshold and so there is no alternative. Some will add that all growing businesses have to cross this bridge at some point and that the short-term loss in revenue will more than be made up by further expansion. If you want to expand the business and see yourself at the head of a wedding photography empire with multiple staff then fine; I suspect however, that you simply want to pootle along by yourself.
I get the impression from your post that you currently operate as a sole trader. If this is the case then you could consider setting up a limited company. Instead of being 'Mike Hummer - Photographer' you could become 'Mike Hummer Photography Ltd'
This would have the effect of re-setting the meter. The company's turnover would start off at nil meaning that there was no requirement to register for VAT, and your personal business would cease. In order to prevent the problem recurring you would have to moniter constantly the company's turnover and make sure it never breached the VAT registration threshold within any period. It can often be cheaper in the long run to go on holiday for a month than to stay at home working if that entails stepping over the threshold.
Some more unscrupulous and devious individuals than I with less respect for the law might even suggest that the odd 'cash job' might be in order.