The right to repair is not so much the right for you to repair your own appliances but more a series of obligations for manufacturers.
This is what the European Parliament says:
After the legal guarantee has expired, the manufacturer is still required to repair common household products, which are technically repairable under EU law, such as washing machines, vacuum cleaners, and even smartphones.
And a little further:
The rules aim to strengthen the EU repair market and reduce repair costs for consumers. Manufacturers will have to provide spare parts and tools at a reasonable price and will be prohibited from using contractual clauses, hardware or software techniques that obstruct repairs. In particular, they cannot impede the use of second-hand or 3D-printed spare parts by independent repairers, nor can they refuse to repair a product solely for economic reasons or because it was previously repaired by someone else.
I would encourage you to get in touch with Beko directly and see what help they can offer. And if you really want to find a service manual, try other websites such as www.manualslib.com or beko.co.uk, and even possibly archive.org.