To answer that Q, you'll have to say exactly what you've got. Is it an Enforcer? An L39, a commercial conversion or wot! Would be interesting to know what your particular wood pegs were for. Rebuilt drawers or a means to prevent L&R movement.
The pags weren't an authorised modification in the UKservice and as such (thread 14), you'd have to be pretty careful at the scrutineers bay before any UK MIlitary competition. If he saw and noticed it and it wasn't approved he could just bar you. The UK Military were also fairly strict about non standard modifications. For example, a couple of L39's that had been used in non service competitions by the local TA Regiment here* were returned to Ordnance when they were withdrawn. A week or so later a snotty report was sent down from RSSD Ordnance to the OC/Quartermaster why the fore-ends had been butchered unlawfully and contrary to EMER spec by having hand-stop/bipod rails inletted. Well, it takes all sorts.
*the rifles were loaned to a local school who'd been using the L39's for many years instead of the crap L81's